diff --git a/src/_gettsim/social_insurance_contributions/eink_grenzen.py b/src/_gettsim/social_insurance_contributions/eink_grenzen.py
index ee63f2a94..66e826327 100644
--- a/src/_gettsim/social_insurance_contributions/eink_grenzen.py
+++ b/src/_gettsim/social_insurance_contributions/eink_grenzen.py
@@ -9,7 +9,9 @@
 def minijob_grenze_unterscheidung_ost_west(
     wohnort_ost: bool, sozialv_beitr_params: dict
 ) -> float:
-    """Select the income threshold depending on place of living.
+    """Minijob income threshold depending on place of living (East or West Germany).
+
+    Until 1999, the threshold is different for East and West Germany.
 
     Parameters
     ----------
@@ -34,7 +36,10 @@ def minijob_grenze_unterscheidung_ost_west(
     params_key_for_rounding="sozialv_beitr",
 )
 def minijob_grenze_einheitlich(sozialv_beitr_params: dict) -> float:
-    """Select the income threshold depending on place of living.
+    """Minijob income threshold depending on place of living.
+
+    From 2000 onwards, the threshold is the same for all of Germany. Until September
+    2022, the threshold is exogenously set.
 
     Parameters
     ----------
@@ -53,8 +58,8 @@ def minijob_grenze_einheitlich(sozialv_beitr_params: dict) -> float:
     params_key_for_rounding="sozialv_beitr",
 )
 def minijob_grenze_from_minimum_wage(sozialv_beitr_params: dict) -> float:
-    """Obtains marginal job threshold since 10/2022. Since then, it is calculated from
-    the statutory minimum wage.
+    """Minijob income threshold since 10/2022. Since then, it is calculated endogenously
+    from the statutory minimum wage.
 
     Parameters
     ----------
@@ -74,7 +79,7 @@ def minijob_grenze_from_minimum_wage(sozialv_beitr_params: dict) -> float:
 
 
 def geringfügig_beschäftigt(bruttolohn_m: float, minijob_grenze: float) -> bool:
-    """Check if individual earns less than marginal employment threshold.
+    """Individual earns less than marginal employment threshold.
 
     Marginal employed pay no social insurance contributions.
 
@@ -102,7 +107,7 @@ def in_gleitzone(
     geringfügig_beschäftigt: bool,
     sozialv_beitr_params: dict,
 ) -> bool:
-    """Check if individual's income is in midi-job range.
+    """Individual's income is in midi-job range.
 
     Employed people with their wage in the range of gleitzone pay reduced social
     insurance contributions.
@@ -366,12 +371,13 @@ def midijob_bemessungsentgelt_m_ab_10_2022(
     minijob_grenze: float,
     sozialv_beitr_params: dict,
 ) -> float:
-    """Total income subject to social insurance contributions for employers a and
-    employees for midijob since October 2022. In the law, the considered income is
-    referred to as "beitragspflichtige Einnahme".
+    """Total income subject to social insurance contributions for midijobs since October
+    2022.
+
+    In the law, the considered income is referred to as "beitragspflichtige Einnahme".
 
-    Beitragspflichtige Einnahme is the reference income for midijobs subject
-    to employer and employee social insurance contribution.
+    Beitragspflichtige Einnahme is the reference income for midijobs subject to employer
+    and employee social insurance contribution.
 
     Legal reference: Changes in § 20 SGB IV from 01.10.2022
 
diff --git a/src/_gettsim/social_insurance_contributions/ges_krankenv.py b/src/_gettsim/social_insurance_contributions/ges_krankenv.py
index 9177f1b2a..69506582f 100644
--- a/src/_gettsim/social_insurance_contributions/ges_krankenv.py
+++ b/src/_gettsim/social_insurance_contributions/ges_krankenv.py
@@ -11,6 +11,8 @@ def ges_krankenv_beitr_arbeitnehmer_m_vor_midijob(
 ) -> float:
     """Employee's public health insurance contribution.
 
+    Before Midijob introduction in April 2003.
+
     Parameters
     ----------
     geringfügig_beschäftigt
@@ -53,6 +55,8 @@ def ges_krankenv_beitr_arbeitnehmer_m_mit_midijob(  # noqa: PLR0913
 ) -> float:
     """Employee's public health insurance contribution.
 
+    After Midijob introduction in April 2003.
+
     Parameters
     ----------
     geringfügig_beschäftigt
@@ -100,6 +104,8 @@ def ges_krankenv_beitr_arbeitgeber_m_vor_midijob(
 ) -> float:
     """Employer's public health insurance contribution.
 
+    Before Midijob introduction in April 2003.
+
     Parameters
     ----------
     geringfügig_beschäftigt
@@ -144,6 +150,8 @@ def ges_krankenv_beitr_arbeitgeber_m_mit_midijob(
 ) -> float:
     """Employer's public health insurance contribution.
 
+    After Midijob introduction in April 2003.
+
     Parameters
     ----------
     geringfügig_beschäftigt
@@ -189,7 +197,7 @@ def ges_krankenv_beitr_arbeitgeber_m_mit_midijob(
 def ges_krankenv_zusatzbeitr_satz_from_sonderbeitr_satz(
     sozialv_beitr_params: dict,
 ) -> float:
-    """Health insurance top-up rate until December 2014.
+    """Health insurance top-up (Zusatzbeitrag) rate until December 2014.
 
     Parameters
     ----------
@@ -212,7 +220,7 @@ def ges_krankenv_zusatzbeitr_satz_from_sonderbeitr_satz(
 def ges_krankenv_zusatzbeitr_satz_from_mean_zusatzbeitrag(
     sozialv_beitr_params: dict,
 ) -> float:
-    """Health insurance top-up rate since January 2015.
+    """Health insurance top-up rate (Zusatzbeitrag) since January 2015.
 
     Parameters
     ----------
@@ -234,9 +242,9 @@ def ges_krankenv_zusatzbeitr_satz_from_mean_zusatzbeitrag(
 def ges_krankenv_beitr_satz_arbeitnehmer(
     sozialv_beitr_params: dict,
 ) -> float:
-    """Contribution rates of employees for health insurance, just a basic split
-    between employees and employers. Incorporates regime changes regarding different
-    values across insurers (pick "official" mean) and same contribution rate for all.
+    """Employee's health insurance contribution rate until June 2005.
+
+    Basic split between employees and employers.
 
     Parameters
     ----------
@@ -258,10 +266,10 @@ def ges_krankenv_beitr_satz_arbeitnehmer(
 def _ges_krankenv_beitr_satz_arbeitnehmer_jahresanfang(
     sozialv_beitr_params: dict,
 ) -> float:
-    """Contribution rates of employees for health insurance for the beginning
-    of a year, just a basic split between employees and employers. Incorporates
-    regime changes regarding different values across insurers (pick "official" mean)
-    and same contribution rate for all.
+    """Employee's health insurance contribution rate for the beginning of the year until
+    June 2005.
+
+    Basic split between employees and employers.
 
     Parameters
     ----------
@@ -290,11 +298,11 @@ def ges_krankenv_beitr_satz_mean_kassenspezifisch_zusatzbeitrag_nur_arbeitnehmer
     ges_krankenv_zusatzbeitr_satz: float,
     sozialv_beitr_params: dict,
 ) -> float:
-    """Contribution rates of employees for health insurance.
+    """Employee's health insurance contribution rate.
 
-    The contribution rates consists of a general rate (split equally between employers
-    and employees, differs across sickness funds) and a top-up rate, which is fully paid
-    by employees.
+    From July 2005 until December 2008. The contribution rates consists of a general
+    rate (split equally between employers and employees, differs across sickness funds)
+    and a top-up rate, which is fully paid by employees.
 
     Parameters
     ----------
@@ -325,12 +333,11 @@ def ges_krankenv_beitr_satz_mean_kassenspezifisch_zusatzbeitrag_nur_arbeitnehmer
     ges_krankenv_zusatzbeitr_satz: float,
     sozialv_beitr_params: dict,
 ) -> float:
-    """Contribution rates of employees for health insurance at the beginning of the
-    year.
+    """Employee's health insurance contribution rate at the beginning of the year.
 
-    The contribution rates consists of a general rate (split equally between employers
-    and employees, differs across sickness funds) and a top-up rate, which is fully paid
-    by employees.
+    From July 2005 until December 2008. The contribution rates consists of a general
+    rate (split equally between employers and employees, differs across sickness funds)
+    and a top-up rate, which is fully paid by employees.
 
     Parameters
     ----------
@@ -361,11 +368,11 @@ def ges_krankenv_beitr_satz_einheitlich_zusatzbeitrag_nur_arbeitnehmer(
     ges_krankenv_zusatzbeitr_satz: float,
     sozialv_beitr_params: dict,
 ) -> float:
-    """Contribution rates of employees for health insurance.
+    """Employee's health insurance contribution rate.
 
-    The contribution rates consists of a general rate (split equally between employers
-    and employees, same for all sickness funds) and a top-up rate, which is fully paid
-    by employees.
+    From January 2009 until December 2018. The contribution rates consists of a general
+    rate (split equally between employers and employees, same for all sickness funds)
+    and a top-up rate, which is fully paid by employees.
 
     Parameters
     ----------
@@ -394,12 +401,11 @@ def ges_krankenv_beitr_satz_einheitlich_zusatzbeitrag_nur_arbeitnehmer_jahresanf
     ges_krankenv_zusatzbeitr_satz: float,
     sozialv_beitr_params: dict,
 ) -> float:
-    """Contribution rates of employees for health insurance at the beginning of the
-    year.
+    """Employee's health insurance contribution rate at the beginning of the year.
 
-    The contribution rates consists of a general rate (split equally between employers
-    and employees, same for all sickness funds) and a top-up rate, which is fully paid
-    by employees.
+    From January 2009 until December 2018. The contribution rates consists of a general
+    rate (split equally between employers and employees, same for all sickness funds)
+    and a top-up rate, which is fully paid by employees.
 
     Parameters
     ----------
@@ -429,9 +435,9 @@ def ges_krankenv_beitr_satz_zusatzbeitrag_arbeitnehmer_paritätisch(
     ges_krankenv_zusatzbeitr_satz: float,
     sozialv_beitr_params: dict,
 ) -> float:
-    """Contribution rates of employees for health insurance.
+    """Employee's health insurance contribution rate.
 
-    Zusatzbeitrag is split equally between employers and employees.
+    Since 2019. Zusatzbeitrag is split equally between employers and employees.
 
     Parameters
     ----------
@@ -456,8 +462,7 @@ def ges_krankenv_beitr_satz_zusatzbeitrag_arbeitnehmer_paritätisch_jahresanfang
     ges_krankenv_zusatzbeitr_satz: float,
     sozialv_beitr_params: dict,
 ) -> float:
-    """Contribution rates of employees for health insurance at the beginning of the
-    year.
+    """Employee's health insurance contribution rate at the beginning of the year.
 
     Zusatzbeitrag is now split equally between employers and employees.
 
@@ -483,7 +488,9 @@ def ges_krankenv_beitr_satz_zusatzbeitrag_arbeitnehmer_paritätisch_jahresanfang
 def ges_krankenv_beitr_satz_arbeitgeber_mean_kassenspezifisch_zusatzbeitrag_nur_arbeitnehmer(  # noqa: E501
     sozialv_beitr_params: dict,
 ) -> float:
-    """Contribution rates of employers for health insurance. Zusatzbeitrag irrelevant.
+    """Employer's health insurance contribution rate.
+
+    Until 2008, the top-up contribution rate (Zusatzbeitrag) was not considered.
 
     Parameters
     ----------
@@ -505,7 +512,9 @@ def ges_krankenv_beitr_satz_arbeitgeber_mean_kassenspezifisch_zusatzbeitrag_nur_
 def ges_krankenv_beitr_satz_arbeitgeber_mean_kassenspezifisch_zusatzbeitrag_nur_arbeitnehmer_jahresanfang(  # noqa: E501
     sozialv_beitr_params: dict,
 ) -> float:
-    """Contribution rates of employers for health insurance. Zusatzbeitrag irrelevant.
+    """Employer's health insurance contribution rate at the begging of the year.
+
+    Until 2008, the top-up contribution rate (Zusatzbeitrag) was not considered.
 
     Parameters
     ----------
@@ -533,8 +542,10 @@ def ges_krankenv_beitr_satz_arbeitgeber_mean_kassenspezifisch_zusatzbeitrag_nur_
 def ges_krankenv_beitr_satz_arbeitgeber_einheitlich_zusatzbeitrag_nur_arbeitnehmer(
     sozialv_beitr_params: dict,
 ) -> float:
-    """Contribution rates of employers for health insurance. Uniform contribution rate
-    for all health insurers, Zusatzbeitrag irrelevant.
+    """Employer's health insurance contribution rate.
+
+    From 2009 until 2018, the contribution rate was uniform for all health insurers,
+    Zusatzbeitrag irrelevant.
 
     Parameters
     ----------
@@ -557,8 +568,10 @@ def ges_krankenv_beitr_satz_arbeitgeber_einheitlich_zusatzbeitrag_nur_arbeitnehm
 def ges_krankenv_beitr_satz_arbeitgeber_einheitlich_zusatzbeitrag_nur_arbeitnehmer_jahresanfang(  # noqa: E501
     sozialv_beitr_params: dict,
 ) -> float:
-    """Contribution rates of employers for health insurance at the beginning of the
-    year. Uniform contribution rate for all health insurers, Zusatzbeitrag irrelevant.
+    """Employer's health insurance contribution rate at the beginning of the year.
+
+    From 2009 until 2018, the contribution rate was uniform for all health insurers,
+    Zusatzbeitrag irrelevant.
 
     Parameters
     ----------
@@ -582,9 +595,10 @@ def ges_krankenv_beitr_satz_arbeitgeber_einheitlich_zusatzbeitrag_nur_arbeitnehm
 def _ges_krankenv_beitr_satz_arbeitgeber_zusatzbeitrag_paritätisch(
     ges_krankenv_beitr_satz_arbeitnehmer: float,
 ) -> float:
-    """Contribution rates of employers for health insurance since 2019.
+    """Employer's health insurance contribution rate.
 
-    The full contribution rate is now split equally between employers and employees.
+    Since 2019, the full contribution rate is now split equally between employers and
+    employees.
 
     Parameters
     ----------
@@ -605,10 +619,10 @@ def _ges_krankenv_beitr_satz_arbeitgeber_zusatzbeitrag_paritätisch(
 def _ges_krankenv_beitr_satz_arbeitgeber_zusatzbeitrag_paritätisch_jahresanfang(
     _ges_krankenv_beitr_satz_arbeitnehmer_jahresanfang: float,
 ) -> float:
-    """Contribution rates of employers for health insurance for the beginning
-    of a year since 2019.
+    """Employer's health insurance contribution rate at the beginning of the year.
 
-    The full contribution rate is now split equally between employers and employees.
+    Since 2019, the full contribution rate is now split equally between employers and
+    employees.
 
     Parameters
     ----------
@@ -626,10 +640,10 @@ def _ges_krankenv_bruttolohn_reg_beschäftigt_m(
     bruttolohn_m: float,
     _ges_krankenv_beitr_bemess_grenze_m: float,
 ) -> float:
-    """Calculate income subject to public health insurance contributions. This does not
-    consider reduced contributions for Mini- and Midijobs.
+    """Income subject to public health insurance contributions.
 
-    Relevant for the computation of payroll taxes.
+    This does not consider reduced contributions for Mini- and Midijobs. Relevant for
+    the computation of payroll taxes.
 
     Parameters
     ----------
@@ -650,8 +664,10 @@ def _ges_krankenv_bruttolohn_m(
     _ges_krankenv_bruttolohn_reg_beschäftigt_m: float,
     regulär_beschäftigt: bool,
 ) -> float:
-    """Calculate the wage subject to public health insurance contributions. This affects
-    marginally employed persons and high wages for above the assessment ceiling.
+    """Wage subject to public health insurance contributions.
+
+    This affects marginally employed persons and high wages for above the assessment
+    ceiling.
 
     Parameters
     ----------
@@ -677,7 +693,7 @@ def _ges_krankenv_bruttolohn_m(
 def _ges_krankenv_beitr_arbeitnehmer_reg_beschäftigt_m(
     _ges_krankenv_bruttolohn_m: float, ges_krankenv_beitr_satz_arbeitnehmer: float
 ) -> float:
-    """Calculate employee's health insurance contributions for regular jobs.
+    """Employee's health insurance contributions for regular jobs.
 
     Parameters
     ----------
@@ -687,8 +703,6 @@ def _ges_krankenv_beitr_arbeitnehmer_reg_beschäftigt_m(
         See :func:`ges_krankenv_beitr_satz_arbeitnehmer`.
     Returns
     -------
-    Pandas Series containing monthly health insurance contributions for regularly
-    employed income.
 
     """
 
@@ -703,9 +717,10 @@ def _ges_krankenv_bemessungsgrundlage_eink_selbständig(
     _ges_krankenv_beitr_bemess_grenze_m: float,
     sozialv_beitr_params: dict,
 ) -> float:
-    """Choose the amount of self-employed income which is subject to health insurance
-    contributions. The value is bounded from below and from above. Only affects those
-    self-employed who voluntarily contribute to the public health system.
+    """Self-employed income which is subject to health insurance contributions.
+
+    The value is bounded from below and from above. Only affects those self-employed who
+    voluntarily contribute to the public health system.
 
     Reference: §240 SGB V Abs. 4
 
@@ -764,7 +779,6 @@ def ges_krankenv_beitr_selbstständig_m(
 
     Returns
     -------
-    Monthly health insurance contributions for self-employed's income.
 
     """
 
@@ -788,7 +802,7 @@ def _ges_krankenv_bemessungsgrundlage_rente_m(
     sum_ges_rente_priv_rente_m: float,
     _ges_krankenv_beitr_bemess_grenze_m: float,
 ) -> float:
-    """Choose the amount of pension which is subject to health insurance contribution.
+    """Pension income which is subject to health insurance contribution.
 
     Parameters
     ----------
@@ -808,7 +822,7 @@ def ges_krankenv_beitr_rentner_m(
     _ges_krankenv_bemessungsgrundlage_rente_m: float,
     ges_krankenv_beitr_satz_arbeitnehmer: float,
 ) -> float:
-    """Calculate health insurance contributions for pension incomes.
+    """Health insurance contributions for pension incomes.
 
     Parameters
     ----------
@@ -818,8 +832,6 @@ def ges_krankenv_beitr_rentner_m(
         See :func:`ges_krankenv_beitr_satz_arbeitnehmer`.
     Returns
     -------
-    Pandas Series containing monthly health insurance contributions on pension income
-    income.
 
     """
 
@@ -834,8 +846,9 @@ def _ges_krankenv_beitr_midijob_sum_arbeitnehmer_arbeitgeber_m(
     ges_krankenv_beitr_satz_arbeitnehmer: float,
     _ges_krankenv_beitr_satz_arbeitgeber: float,
 ) -> float:
-    """Calculating the sum of employee and employer health insurance contribution for
-    midijobs.
+    """Sum of employee and employer health insurance contribution for midijobs.
+
+    Midijobs were introduced in April 2003.
 
     Parameters
     ----------
@@ -866,6 +879,8 @@ def _ges_krankenv_beitr_midijob_arbeitgeber_m_anteil_bruttolohn(
 ) -> float:
     """Employers' health insurance contribution for midijobs until September 2022.
 
+    Midijobs were introduced in April 2003.
+
     Parameters
     ----------
     bruttolohn_m
@@ -894,7 +909,7 @@ def _ges_krankenv_beitr_midijob_arbeitgeber_m_residuum(
     _ges_krankenv_beitr_midijob_arbeitnehmer_m: float,
     in_gleitzone: bool,
 ) -> float:
-    """Calculating the employer health insurance contribution for midijobs since October
+    """Employer's health insurance contribution for midijobs since October
     2022.
 
     Parameters
@@ -956,8 +971,7 @@ def _ges_krankenv_beitr_midijob_arbeitnehmer_m_anteil_beitragspfl_einnahme(
     _midijob_beitragspfl_einnahme_arbeitnehmer_m: float,
     ges_krankenv_beitr_satz_arbeitnehmer: float,
 ) -> float:
-    """Calculating the employee health insurance contribution for midijobs since October
-    2022.
+    """Employee's health insurance contribution for midijobs since October 2022.
 
     Parameters
     ----------
diff --git a/src/_gettsim/social_insurance_contributions/ges_pflegev.py b/src/_gettsim/social_insurance_contributions/ges_pflegev.py
index 53da7132e..2efb0c7dd 100644
--- a/src/_gettsim/social_insurance_contributions/ges_pflegev.py
+++ b/src/_gettsim/social_insurance_contributions/ges_pflegev.py
@@ -9,6 +9,9 @@ def ges_pflegev_zusatz_kinderlos(
 ) -> bool:
     """Whether additional care insurance contribution for childless individuals applies.
 
+    Not relevant before 2005 because the contribution rate was independent of the number
+    of children.
+
     Parameters
     ----------
     hat_kinder
@@ -36,6 +39,8 @@ def ges_pflegev_beitr_satz_arbeitnehmer_ohne_zusatz_fuer_kinderlose(
 ) -> float:
     """Employee's long-term care insurance contribution rate.
 
+    Before 2005, the contribution rate was independent of the number of children.
+
     Parameters
     ----------
     sozialv_beitr_params
@@ -58,7 +63,9 @@ def ges_pflegev_beitr_satz_arbeitnehmer_zusatz_kinderlos_dummy(
     ges_pflegev_zusatz_kinderlos: bool,
     sozialv_beitr_params: dict,
 ) -> float:
-    """Employee's ong-term care insurance contribution rate.
+    """Employee's long-term care insurance contribution rate.
+
+    Since 2005, the contribution rate is increased for childless individuals.
 
     Parameters
     ----------
@@ -86,8 +93,10 @@ def ges_pflegev_beitr_satz_arbeitnehmer_mit_kinder_abschlag(
     ges_pflegev_zusatz_kinderlos: bool,
     sozialv_beitr_params: dict,
 ) -> float:
-    """Employee's are insurance contribution rate.
-    For individuals with children younger than 25 rates are reduced.
+    """Employee's long-term care insurance contribution rate.
+
+    Since July 2023, the contribution rate is reduced for individuals with children
+    younger than 25.
 
     Parameters
     ----------
@@ -142,6 +151,7 @@ def ges_pflegev_beitr_arbeitnehmer_m_vor_midijob(
 
     Returns
     -------
+    Employee's long-term care insurance contributions.
 
     """
 
@@ -187,6 +197,7 @@ def ges_pflegev_beitr_arbeitnehmer_m_mit_midijob(  # noqa: PLR0913
 
     Returns
     -------
+    Employee's long-term care insurance contributions.
 
     """
 
@@ -218,6 +229,7 @@ def _ges_pflegev_beitr_arbeitnehmer_reg_beschäftigt_m(
 
     Returns
     -------
+    Long-term care insurance contributions of employer and employee.
 
     """
 
@@ -237,6 +249,8 @@ def ges_pflegev_beitr_arbeitgeber_m_vor_midijob(
 ) -> float:
     """Employer's long-term care insurance contribution.
 
+    Before Midijob introduction in April 2003.
+
     Parameters
     ----------
     geringfügig_beschäftigt
@@ -250,6 +264,7 @@ def ges_pflegev_beitr_arbeitgeber_m_vor_midijob(
 
     Returns
     -------
+    Employer's long-term care insurance contributions.
 
     """
     # Calculate care insurance contributions for regular jobs.
@@ -276,6 +291,8 @@ def ges_pflegev_beitr_arbeitgeber_m_mit_midijob(
 ) -> float:
     """Employer's long-term care insurance contribution.
 
+    After Midijob introduction in April 2003.
+
     Parameters
     ----------
     geringfügig_beschäftigt
@@ -293,6 +310,7 @@ def ges_pflegev_beitr_arbeitgeber_m_mit_midijob(
 
     Returns
     -------
+    Employer's long-term care insurance contributions.
 
     """
     # Calculate care insurance contributions for regular jobs.
@@ -336,7 +354,7 @@ def ges_pflegev_beitr_selbstständig_m_ohne_zusatz_fuer_kinderlose(
 
     Returns
     -------
-    Monthly care insurance contributions for self employed income.
+    Self-employed long-term care insurance contributions.
 
     """
     out = _ges_krankenv_bemessungsgrundlage_eink_selbständig * (
@@ -371,7 +389,7 @@ def ges_pflegev_beitr_selbstständig_m_zusatz_kinderlos_dummy(
 
     Returns
     -------
-    Monthly care insurance contributions for self employed income.
+    Self-employed long-term care insurance contributions.
 
     """
     out = _ges_krankenv_bemessungsgrundlage_eink_selbständig * (
@@ -391,7 +409,8 @@ def ges_pflegev_beitr_rentner_m_reduz_beitrag(
     _ges_krankenv_bemessungsgrundlage_rente_m: float,
     ges_pflegev_beitr_satz_arbeitnehmer: float,
 ) -> float:
-    """Long-term care insurance contribution from pension income.
+    """Long-term care insurance contribution from pension income from 1995 until March
+    2004.
 
     Pensioners pay the same contribution as employees.
 
@@ -404,7 +423,7 @@ def ges_pflegev_beitr_rentner_m_reduz_beitrag(
 
     Returns
     -------
-    Monthly health insurance contributions for pension income.
+    Retiree's long-term care insurance contributions.
 
     """
     out = (
@@ -436,7 +455,7 @@ def ges_pflegev_beitr_rentner_m_ohne_zusatz_für_kinderlose(
 
     Returns
     -------
-    Monthly health insurance contributions for pension income.
+    Retiree's long-term care insurance contributions.
 
     """
     out = _ges_krankenv_bemessungsgrundlage_rente_m * (
@@ -468,7 +487,7 @@ def ges_pflegev_beitr_rentner_m_zusatz_kinderlos_dummy(
 
     Returns
     -------
-    Monthly health insurance contributions for pension income.
+    Retiree's long-term care insurance contributions.
 
     """
     out = _ges_krankenv_bemessungsgrundlage_rente_m * (
@@ -502,6 +521,8 @@ def _ges_pflegev_beitr_midijob_sum_arbeitnehmer_arbeitgeber_m_bis_2004(
 
     Returns
     -------
+    Long-term care insurance contributions of employer and employee.
+
 
     """
 
@@ -535,6 +556,7 @@ def _ges_pflegev_beitr_midijob_sum_arbeitnehmer_arbeitgeber_m_ab_2005(
 
     Returns
     -------
+    Long-term care insurance contributions of employer and employee.
 
     """
 
@@ -566,6 +588,8 @@ def _ges_pflegev_beitr_midijob_arbeitgeber_m_anteil_bruttolohn_bis_2004(
 
     Returns
     -------
+    Employer's long-term care insurance contributions.
+
 
     """
 
@@ -596,6 +620,7 @@ def _ges_pflegev_beitr_midijob_arbeitgeber_m_anteil_bruttolohn_ab_2005(
 
     Returns
     -------
+    Employer's long-term care insurance contributions.
 
     """
     out = bruttolohn_m * sozialv_beitr_params["beitr_satz"]["ges_pflegev"]["standard"]
@@ -621,6 +646,7 @@ def _ges_pflegev_beitr_midijob_arbeitgeber_m_residuum(
 
     Returns
     -------
+    Employer's long-term care insurance contributions.
 
     """
     out = (
@@ -650,6 +676,7 @@ def _ges_pflegev_beitr_midijob_arbeitnehmer_m_residuum(
 
     Returns
     -------
+    Employee's long-term care insurance contributions.
 
     """
     out = (
@@ -687,6 +714,7 @@ def _ges_pflegev_beitr_midijob_arbeitnehmer_m_anteil_beitragspfl_einnahme(
 
     Returns
     -------
+    Employee's long-term care insurance contributions.
 
     """
     # Calculate the employee care insurance contribution
@@ -732,6 +760,7 @@ def _ges_pflegev_beitr_midijob_arbeitnehmer_m_anteil_mit_kinder_abschlag(
 
     Returns
     -------
+    Employee's long-term care insurance contributions.
 
     """
     # Calculate the employee care insurance rate
diff --git a/src/_gettsim/social_insurance_contributions/ges_rentenv.py b/src/_gettsim/social_insurance_contributions/ges_rentenv.py
index 9ec1a6328..4c5954e7e 100644
--- a/src/_gettsim/social_insurance_contributions/ges_rentenv.py
+++ b/src/_gettsim/social_insurance_contributions/ges_rentenv.py
@@ -9,6 +9,8 @@ def ges_rentenv_beitr_arbeitnehmer_m_vor_midijob(
 ) -> float:
     """Employee's public pension insurance contribution.
 
+    Before Midijob introduction in April 2003.
+
     Parameters
     ----------
     geringfügig_beschäftigt
@@ -45,6 +47,8 @@ def ges_rentenv_beitr_arbeitnehmer_m_mit_midijob(
 ) -> float:
     """Employee's public pension insurance contribution.
 
+    After Midijob introduction in April 2003.
+
     Parameters
     ----------
     geringfügig_beschäftigt
@@ -86,6 +90,8 @@ def ges_rentenv_beitr_arbeitgeber_m_vor_midijob(
 ) -> float:
     """Employer's public pension insurance contribution.
 
+    Before Midijob introduction in April 2003.
+
     Parameters
     ----------
     geringfügig_beschäftigt
@@ -125,6 +131,8 @@ def ges_rentenv_beitr_arbeitgeber_m_mit_midijob(
 ) -> float:
     """Employer's public pension insurance contribution.
 
+    After Midijob introduction in April 2003.
+
     Parameters
     ----------
     geringfügig_beschäftigt
@@ -165,6 +173,7 @@ def _ges_rentenv_beitr_midijob_sum_arbeitnehmer_arbeitgeber_m(
     sozialv_beitr_params: dict,
 ) -> float:
     """Sum of employer and employee pension insurance contribution for midijobs.
+    Midijobs were introduced in April 2003.
 
     Parameters
     ----------
@@ -296,7 +305,7 @@ def _ges_rentenv_beitr_bruttolohn_m(
     bruttolohn_m: float,
     _ges_rentenv_beitr_bemess_grenze_m: float,
 ) -> float:
-    """Calculate the wage subject to pension and unemployment insurance contributions.
+    """Wage subject to pension and unemployment insurance contributions.
 
     Parameters
     ----------