diff --git a/docs/source/conf.py b/docs/source/conf.py
index 6981a21..0035a53 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -60,7 +60,7 @@
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = 'en'
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
diff --git a/docs/source/functions/multiFidelityFunction.rst b/docs/source/functions/multi_fidelity_function.rst
similarity index 75%
rename from docs/source/functions/multiFidelityFunction.rst
rename to docs/source/functions/multi_fidelity_function.rst
index 6af9425..50c3ce2 100644
--- a/docs/source/functions/multiFidelityFunction.rst
+++ b/docs/source/functions/multi_fidelity_function.rst
@@ -1,7 +1,7 @@
 MultiFidelityFunction
 =====================
 
-.. automodule:: mf2.multiFidelityFunction
+.. automodule:: mf2.multi_fidelity_function
     :members:
     :special-members: __init__
     :undoc-members:
diff --git a/docs/source/mf2.rst b/docs/source/mf2.rst
index d95e204..446717e 100644
--- a/docs/source/mf2.rst
+++ b/docs/source/mf2.rst
@@ -5,7 +5,7 @@ Fixed Functions
 ---------------
 .. toctree::
 
-   functions/multiFidelityFunction
+   functions/multi_fidelity_function
    functions/bohachevsky
    functions/booth
    functions/borehole
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 3165344..c548482 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -5,3 +5,5 @@ pyprojroot
 pytest
 pytest-cov
 pytest-regressions
+sphinx
+sphinx_rtd_theme