diff --git a/lib/credo/check.ex b/lib/credo/check.ex
index 87f358dc4..a9d7e27f5 100644
--- a/lib/credo/check.ex
+++ b/lib/credo/check.ex
@@ -1,9 +1,15 @@
 defmodule Credo.Check do
-  @doc """
+  @moduledoc """
   `Check` modules represent the checks which are run during the code analysis.
+
+  Example:
+
+      defmodule MyCheck do
+        use Credo.Check, category: :warning, base_priority: :high, elixir_version: ">= 1.3"
+      end
   """
 
-  alias Credo.Priority
+  @type t :: module
 
   @base_category_exit_status_map %{
     consistency: 1,
@@ -13,8 +19,9 @@ defmodule Credo.Check do
     warning: 16
   }
 
-  @type t :: module
+  alias Credo.Priority
 
+  @doc false
   defmacro __using__(opts) do
     quote do
       @behaviour Credo.Check
diff --git a/lib/credo/check/code_helper.ex b/lib/credo/check/code_helper.ex
index d2d3fe95b..966f3ad7d 100644
--- a/lib/credo/check/code_helper.ex
+++ b/lib/credo/check/code_helper.ex
@@ -50,6 +50,8 @@ defmodule Credo.Check.CodeHelper do
       true
 
   """
+  def matches?(name, value)
+
   def matches?(name, list) when is_list(list) do
     Enum.any?(list, &matches?(name, &1))
   end
@@ -69,8 +71,8 @@ defmodule Credo.Check.CodeHelper do
 
   Examples:
 
-    {:defmodule, "Foo.Bar"}
-    {:def, "Foo.Bar.baz"}
+      {:defmodule, "Foo.Bar"}
+      {:def, "Foo.Bar.baz"}
   """
   def scope_for(source_file, line: line_no) do
     source_file
diff --git a/lib/credo/check/config_comment.ex b/lib/credo/check/config_comment.ex
index bc8dd935f..3236f3f82 100644
--- a/lib/credo/check/config_comment.ex
+++ b/lib/credo/check/config_comment.ex
@@ -1,16 +1,31 @@
 defmodule Credo.Check.ConfigComment do
-  defstruct line_no: nil,
-            line_no_end: nil,
-            instruction: nil,
-            params: nil
+  @moduledoc """
+  `ConfigComment` structs represent comments which follow control Credo's behaviour.
 
-  alias Credo.Issue
+  The following comments are supported:
+
+      # credo:disable-for-this-file
+      # credo:disable-for-next-line
+      # credo:disable-for-previous-line
+      # credo:disable-for-lines:<number>
+
+  """
 
   @instruction_disable_file "disable-for-this-file"
   @instruction_disable_next_line "disable-for-next-line"
   @instruction_disable_previous_line "disable-for-previous-line"
   @instruction_disable_lines "disable-for-lines"
 
+  alias Credo.Issue
+
+  defstruct line_no: nil,
+            line_no_end: nil,
+            instruction: nil,
+            params: nil
+
+  @doc "Returns a `ConfigComment` struct based on the given parameters."
+  def new(instruction, param_string, line_no)
+
   def new("#{@instruction_disable_lines}:" <> line_count, param_string, line_no) do
     line_count = String.to_integer(line_count)
 
@@ -44,6 +59,9 @@ defmodule Credo.Check.ConfigComment do
     }
   end
 
+  @doc "Returns `true` if the given `issue` should be ignored based on the given `config_comment`"
+  def ignores_issue?(config_comment, issue)
+
   def ignores_issue?(
         %__MODULE__{instruction: @instruction_disable_file, params: params},
         %Issue{} = issue
@@ -92,6 +110,8 @@ defmodule Credo.Check.ConfigComment do
     false
   end
 
+  #
+
   defp params_ignore_issue?([], _issue) do
     true
   end
diff --git a/lib/credo/check/config_comment_finder.ex b/lib/credo/check/config_comment_finder.ex
index f13e84e4b..f2f42910b 100644
--- a/lib/credo/check/config_comment_finder.ex
+++ b/lib/credo/check/config_comment_finder.ex
@@ -1,6 +1,11 @@
 defmodule Credo.Check.ConfigCommentFinder do
   @moduledoc """
+  This check is used internally by Credo.
+
+  It traverses the given codebase to find `Credo.Check.ConfigComment`
+  compatible comments, which control Credo's behaviour.
   """
+
   @explanation nil
   @config_comment_format ~r/#\s*credo\:([\w-\:]+)\s*(.*)/im
 
diff --git a/lib/credo/check/params.ex b/lib/credo/check/params.ex
index dec9e6b41..01113880d 100644
--- a/lib/credo/check/params.ex
+++ b/lib/credo/check/params.ex
@@ -1,5 +1,19 @@
 defmodule Credo.Check.Params do
-  @doc "Returns the given `field`'s params value."
+  @moduledoc """
+  This module provides functions for handling parameters ("params") given to
+  checks through `.credo.exs` (i.e. the `Credo.ConfigFile`).
+  """
+
+  @doc """
+  Returns the given `field`'s `params` value.
+
+  Example:
+
+      iex> Credo.Check.Params.get([], :foo, [foo: "bar"])
+      "bar"
+      iex> Credo.Check.Params.get([foo: "baz"], :foo, [foo: "bar"])
+      "baz"
+  """
   def get(params, field, default_params \\ []) when is_list(params) do
     case params[field] do
       nil ->
diff --git a/lib/credo/check/readability/semicolons.ex b/lib/credo/check/readability/semicolons.ex
index 54ec48aec..2a6742b5b 100644
--- a/lib/credo/check/readability/semicolons.ex
+++ b/lib/credo/check/readability/semicolons.ex
@@ -3,6 +3,15 @@ defmodule Credo.Check.Readability.Semicolons do
   Don't use ; to separate statements and expressions.
   Statements and expressions should be separated by lines.
 
+      # preferred
+
+      a = 1
+      b = 2
+
+      # NOT preferred
+
+      a = 1; b = 2
+
   Like all `Readability` issues, this one is not a technical concern.
   But you can improve the odds of others reading and liking your code by making
   it easier to follow.
diff --git a/lib/credo/check/readability/trailing_blank_line.ex b/lib/credo/check/readability/trailing_blank_line.ex
index 54b1846d1..4ec129f41 100644
--- a/lib/credo/check/readability/trailing_blank_line.ex
+++ b/lib/credo/check/readability/trailing_blank_line.ex
@@ -3,7 +3,7 @@ defmodule Credo.Check.Readability.TrailingBlankLine do
   Files should end in a trailing blank line.
 
   This is mostly for historical reasons: every text file should end with a \\n,
-  or newline since this acts as `eol´ or the end of the line character.
+  or newline since this acts as `eol` or the end of the line character.
 
   See also: http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206
 
diff --git a/lib/credo/check/refactor/abc_size.ex b/lib/credo/check/refactor/abc_size.ex
index 570543a0a..947194aee 100644
--- a/lib/credo/check/refactor/abc_size.ex
+++ b/lib/credo/check/refactor/abc_size.ex
@@ -23,11 +23,11 @@ defmodule Credo.Check.Refactor.ABCSize do
   @branch_ops [:.]
   @condition_ops [:if, :unless, :for, :try, :case, :cond, :and, :or, :&&, :||]
 
+  use Credo.Check
+
   alias Credo.Check.CodeHelper
   alias Credo.SourceFile
 
-  use Credo.Check
-
   @doc false
   def run(source_file, params \\ []) do
     issue_meta = IssueMeta.for(source_file, params)
diff --git a/lib/credo/check/refactor/cyclomatic_complexity.ex b/lib/credo/check/refactor/cyclomatic_complexity.ex
index 496d70408..f1d8be8ab 100644
--- a/lib/credo/check/refactor/cyclomatic_complexity.ex
+++ b/lib/credo/check/refactor/cyclomatic_complexity.ex
@@ -38,11 +38,11 @@ defmodule Credo.Check.Refactor.CyclomaticComplexity do
     cond: 1
   ]
 
+  use Credo.Check
+
   alias Credo.Check.CodeHelper
   alias Credo.SourceFile
 
-  use Credo.Check
-
   @doc false
   def run(source_file, params \\ []) do
     issue_meta = IssueMeta.for(source_file, params)
diff --git a/lib/credo/check/refactor/function_arity.ex b/lib/credo/check/refactor/function_arity.ex
index d63ec777f..6202f65b0 100644
--- a/lib/credo/check/refactor/function_arity.ex
+++ b/lib/credo/check/refactor/function_arity.ex
@@ -16,10 +16,10 @@ defmodule Credo.Check.Refactor.FunctionArity do
   @default_params [max_arity: 8, ignore_defp: false]
   @def_ops [:def, :defp, :defmacro]
 
-  alias Credo.Code.Parameters
-
   use Credo.Check
 
+  alias Credo.Code.Parameters
+
   @doc false
   def run(source_file, params \\ []) do
     issue_meta = IssueMeta.for(source_file, params)
diff --git a/lib/credo/check/refactor/nesting.ex b/lib/credo/check/refactor/nesting.ex
index d0b4544dd..9414fdacf 100644
--- a/lib/credo/check/refactor/nesting.ex
+++ b/lib/credo/check/refactor/nesting.ex
@@ -32,10 +32,10 @@ defmodule Credo.Check.Refactor.Nesting do
   @def_ops [:def, :defp, :defmacro]
   @nest_ops [:if, :unless, :case, :cond, :fn]
 
-  alias Credo.Check.CodeHelper
-
   use Credo.Check
 
+  alias Credo.Check.CodeHelper
+
   @doc false
   def run(source_file, params \\ []) do
     issue_meta = IssueMeta.for(source_file, params)
diff --git a/lib/credo/check/refactor/perceived_complexity.ex b/lib/credo/check/refactor/perceived_complexity.ex
index ee090cade..70c78afaa 100644
--- a/lib/credo/check/refactor/perceived_complexity.ex
+++ b/lib/credo/check/refactor/perceived_complexity.ex
@@ -38,11 +38,11 @@ defmodule Credo.Check.Refactor.PerceivedComplexity do
     cond: 1
   ]
 
+  use Credo.Check
+
   alias Credo.Check.CodeHelper
   alias Credo.SourceFile
 
-  use Credo.Check
-
   @doc false
   def run(source_file, params \\ []) do
     issue_meta = IssueMeta.for(source_file, params)
diff --git a/lib/credo/check/refactor/variable_rebinding.ex b/lib/credo/check/refactor/variable_rebinding.ex
index 2b739f635..f376f042e 100644
--- a/lib/credo/check/refactor/variable_rebinding.ex
+++ b/lib/credo/check/refactor/variable_rebinding.ex
@@ -32,10 +32,10 @@ defmodule Credo.Check.Refactor.VariableRebinding do
     check: @moduledoc
   ]
 
-  alias Credo.Check.CodeHelper
-
   use Credo.Check
 
+  alias Credo.Check.CodeHelper
+
   @doc false
   def run(source_file, params \\ []) do
     issue_meta = IssueMeta.for(source_file, params)
diff --git a/lib/credo/check/runner.ex b/lib/credo/check/runner.ex
index 3e15948f8..5dd842312 100644
--- a/lib/credo/check/runner.ex
+++ b/lib/credo/check/runner.ex
@@ -1,4 +1,9 @@
 defmodule Credo.Check.Runner do
+  @moduledoc """
+  This module is responsible for running checks based on the context represented
+  by the current `Credo.Execution`.
+  """
+
   alias Credo.CLI.Output.UI
   alias Credo.Execution
   alias Credo.Execution.Issues
@@ -38,7 +43,7 @@ defmodule Credo.Check.Runner do
     :ok
   end
 
-  @doc "Runs the ConfigCommentFinder"
+  @doc "Runs the ConfigCommentFinder."
   def run_config_comment_finder(source_files, exec) do
     {Credo.Check.ConfigCommentFinder}
     |> run_check(source_files, exec)
diff --git a/lib/credo/cli.ex b/lib/credo/cli.ex
index 7aeef2668..91908d075 100644
--- a/lib/credo/cli.ex
+++ b/lib/credo/cli.ex
@@ -1,6 +1,6 @@
 defmodule Credo.CLI do
   @moduledoc """
-  Credo.CLI is the entrypoint for both the Mix task and the escript.
+  `Credo.CLI` is the entrypoint for both the Mix task and the escript.
 
   It takes the parameters passed from the command line and translates them into
   a Command module (see the `Credo.CLI.Command` namespace), the work directory
diff --git a/lib/credo/cli/filename.ex b/lib/credo/cli/filename.ex
index 8d4e7925e..cee6c2ddc 100644
--- a/lib/credo/cli/filename.ex
+++ b/lib/credo/cli/filename.ex
@@ -1,5 +1,7 @@
 defmodule Credo.CLI.Filename do
-  @moduledoc false
+  @moduledoc """
+  This module can be used to handle filenames given at the command line.
+  """
 
   @doc """
   Returns `true` if a given `filename` contains a pos_suffix.
diff --git a/lib/credo/cli/options.ex b/lib/credo/cli/options.ex
index ff6a1c3a5..c045f20de 100644
--- a/lib/credo/cli/options.ex
+++ b/lib/credo/cli/options.ex
@@ -1,10 +1,7 @@
 defmodule Credo.CLI.Options do
-  defstruct command: nil,
-            path: nil,
-            args: [],
-            switches: nil,
-            unknown_switches: [],
-            unknown_args: []
+  @moduledoc """
+  The `Options` struct represents the options given on the command line.
+  """
 
   @switches [
     all_priorities: :boolean,
@@ -39,6 +36,20 @@ defmodule Credo.CLI.Options do
 
   alias Credo.Priority
 
+  defstruct command: nil,
+            path: nil,
+            args: [],
+            switches: nil,
+            unknown_switches: [],
+            unknown_args: []
+
+  @doc """
+  Returns a `Options` struct for the given parameters.
+
+      iex> Credo.CLI.Options.parse(["alice", "--debug"], ".", ["alice", "bob", "eve"], [])
+      %Credo.CLI.Options{args: [], command: "alice", path: ".", switches: %{debug: true}, unknown_args: [], unknown_switches: []}
+
+  """
   def parse(argv, current_dir, command_names, ignored_args) do
     argv
     |> OptionParser.parse(strict: @switches, aliases: @aliases)
diff --git a/lib/credo/cli/output.ex b/lib/credo/cli/output.ex
index 251323f4e..a5b11047e 100644
--- a/lib/credo/cli/output.ex
+++ b/lib/credo/cli/output.ex
@@ -1,9 +1,13 @@
 defmodule Credo.CLI.Output do
-  alias Credo.CLI.Output.UI
-  alias Credo.Execution
+  @moduledoc """
+  This module provides helper functions regarding command line output.
+  """
 
   @category_tag_map %{"refactor" => "F"}
 
+  alias Credo.CLI.Output.UI
+  alias Credo.Execution
+
   def check_tag(category, in_parens \\ true)
 
   def check_tag(category, in_parens) when is_binary(category) do
diff --git a/lib/credo/cli/output/format_delegator.ex b/lib/credo/cli/output/format_delegator.ex
index cd7f5df1e..9b6190ffd 100644
--- a/lib/credo/cli/output/format_delegator.ex
+++ b/lib/credo/cli/output/format_delegator.ex
@@ -1,9 +1,19 @@
 defmodule Credo.CLI.Output.FormatDelegator do
   @moduledoc """
-  The FormatDelegator module can be used to easily delegate print-statements
-  for different formats to different modules.
+  This module can be used to easily delegate print-statements for different
+  formats to different modules.
+
+  Example:
+
+      use Credo.CLI.Output.FormatDelegator,
+        default: Credo.CLI.Command.Suggest.Output.Default,
+        flycheck: Credo.CLI.Command.Suggest.Output.FlyCheck,
+        oneline: Credo.CLI.Command.Suggest.Output.Oneline,
+        json: Credo.CLI.Command.Suggest.Output.Json
+
   """
 
+  @doc false
   defmacro __using__(format_list) do
     format_mods =
       Enum.map(format_list, fn {format, output_mod} ->
diff --git a/lib/credo/cli/output/shell.ex b/lib/credo/cli/output/shell.ex
index e3e45cc29..2492bf4bb 100644
--- a/lib/credo/cli/output/shell.ex
+++ b/lib/credo/cli/output/shell.ex
@@ -1,7 +1,8 @@
 defmodule Credo.CLI.Output.Shell do
   @moduledoc """
-  GenServer used by Credo.CLI.Output.UI to write to the shell.
+  This module is used by `Credo.CLI.Output.UI` to write to the shell.
   """
+
   use GenServer
 
   def start_link(opts \\ []) do
diff --git a/lib/credo/cli/output/summary.ex b/lib/credo/cli/output/summary.ex
index 998611485..9f381bec6 100644
--- a/lib/credo/cli/output/summary.ex
+++ b/lib/credo/cli/output/summary.ex
@@ -1,8 +1,7 @@
 defmodule Credo.CLI.Output.Summary do
-  alias Credo.CLI.Output
-  alias Credo.CLI.Output.UI
-  alias Credo.Execution
-  alias Credo.SourceFile
+  @moduledoc """
+  This module is responsible for printing the summary at the end of the analysis.
+  """
 
   @category_wording [
     {:consistency, "consistency issue", "consistency issues"},
@@ -13,6 +12,11 @@ defmodule Credo.CLI.Output.Summary do
   ]
   @cry_for_help "Please report incorrect results: https://github.com/rrrene/credo/issues"
 
+  alias Credo.CLI.Output
+  alias Credo.CLI.Output.UI
+  alias Credo.Execution
+  alias Credo.SourceFile
+
   def print(
         _source_files,
         %Execution{format: "flycheck"},
diff --git a/lib/credo/cli/output/ui.ex b/lib/credo/cli/output/ui.ex
index 28f805425..a02804908 100644
--- a/lib/credo/cli/output/ui.ex
+++ b/lib/credo/cli/output/ui.ex
@@ -1,4 +1,8 @@
 defmodule Credo.CLI.Output.UI do
+  @moduledoc """
+  This module provides functions used to create the UI.
+  """
+
   @edge "┃"
   @ellipsis "…"
   @shell_service Credo.CLI.Output.Shell
diff --git a/lib/credo/code/scope.ex b/lib/credo/code/scope.ex
index 07a23c811..a04e9e821 100644
--- a/lib/credo/code/scope.ex
+++ b/lib/credo/code/scope.ex
@@ -31,8 +31,8 @@ defmodule Credo.Code.Scope do
 
   Examples:
 
-    {:defmodule, "Foo.Bar"}
-    {:def, "Foo.Bar.baz"}
+      {:defmodule, "Foo.Bar"}
+      {:def, "Foo.Bar.baz"}
   """
   def name(_ast, line: 0), do: nil
 
diff --git a/lib/credo/config_file.ex b/lib/credo/config_file.ex
index 8c5b7c89b..9a3d05fa5 100644
--- a/lib/credo/config_file.ex
+++ b/lib/credo/config_file.ex
@@ -3,14 +3,6 @@ defmodule Credo.ConfigFile do
   `ConfigFile` structs represent all loaded and merged config files in a run.
   """
 
-  defstruct files: nil,
-            color: true,
-            checks: nil,
-            requires: [],
-            strict: false,
-            # checks if there is a new version of Credo
-            check_for_updates: true
-
   @config_filename ".credo.exs"
   @default_config_name "default"
   @default_config_file File.read!(@config_filename)
@@ -19,6 +11,14 @@ defmodule Credo.ConfigFile do
   @default_files_included [@default_glob]
   @default_files_excluded []
 
+  defstruct files: nil,
+            color: true,
+            checks: nil,
+            requires: [],
+            strict: false,
+            # checks if there is a new version of Credo
+            check_for_updates: true
+
   @doc """
   Returns Execution struct representing a consolidated Execution for all `.credo.exs`
   files in `relevant_directories/1` merged into the default configuration.
diff --git a/lib/credo/execution.ex b/lib/credo/execution.ex
index a37e82a31..ef7fb659f 100644
--- a/lib/credo/execution.ex
+++ b/lib/credo/execution.ex
@@ -4,6 +4,11 @@ defmodule Credo.Execution do
   manipulated via the `Credo.Execution` module.
   """
 
+  @type t :: module
+
+  alias Credo.Execution.Issues
+  alias Credo.Execution.SourceFiles
+
   defstruct argv: [],
             cli_options: nil,
 
@@ -39,11 +44,6 @@ defmodule Credo.Execution do
             results: %{},
             config_comment_map: %{}
 
-  @type t :: module
-
-  alias Credo.Execution.Issues
-  alias Credo.Execution.SourceFiles
-
   @doc """
   Returns the checks that should be run for a given `exec` struct.
 
diff --git a/lib/credo/issue.ex b/lib/credo/issue.ex
index 2aedf9cc6..6de3067c6 100644
--- a/lib/credo/issue.ex
+++ b/lib/credo/issue.ex
@@ -3,6 +3,8 @@ defmodule Credo.Issue do
   `Issue` structs represent all issues found during the code analysis.
   """
 
+  @type t :: module
+
   defstruct check: nil,
             category: nil,
             priority: 0,
@@ -19,6 +21,4 @@ defmodule Credo.Issue do
             # optional: the name of the module, macro or
             #  function where the issue was found
             scope: nil
-
-  @type t :: module
 end
diff --git a/lib/credo/source_file.ex b/lib/credo/source_file.ex
index 380f6ec6c..b349d9183 100644
--- a/lib/credo/source_file.ex
+++ b/lib/credo/source_file.ex
@@ -1,6 +1,7 @@
 defmodule Credo.SourceFile do
-  defstruct filename: nil,
-            valid?: nil
+  @moduledoc """
+  `SourceFile` structs represent a source file in the codebase.
+  """
 
   @type t :: module
 
@@ -8,6 +9,18 @@ defmodule Credo.SourceFile do
   alias Credo.Service.SourceFileLines
   alias Credo.Service.SourceFileSource
 
+  defstruct filename: nil,
+            valid?: nil
+
+  defimpl Inspect, for: __MODULE__ do
+    def inspect(source_file, _opts) do
+      "%SourceFile<#{source_file.filename}>"
+    end
+  end
+
+  @doc """
+  Retuns a `SourceFile` struct for the given `source` code and `filename`.
+  """
   def parse(source, filename) do
     filename = Path.relative_to_cwd(filename)
     lines = Credo.Code.to_lines(source)
@@ -31,6 +44,9 @@ defmodule Credo.SourceFile do
     }
   end
 
+  @doc "Retuns the AST for the given `source_file`."
+  def ast(source_file)
+
   def ast(%__MODULE__{filename: filename}) do
     case SourceFileAST.get(filename) do
       {:ok, ast} ->
@@ -41,6 +57,9 @@ defmodule Credo.SourceFile do
     end
   end
 
+  @doc "Retuns the lines of source code for the given `source_file`."
+  def lines(source_file)
+
   def lines(%__MODULE__{filename: filename}) do
     case SourceFileLines.get(filename) do
       {:ok, lines} ->
@@ -51,6 +70,9 @@ defmodule Credo.SourceFile do
     end
   end
 
+  @doc "Retuns the source code for the given `source_file`."
+  def source(source_file)
+
   def source(%__MODULE__{filename: filename}) do
     case SourceFileSource.get(filename) do
       {:ok, source} ->
@@ -91,6 +113,8 @@ defmodule Credo.SourceFile do
 
   NOTE: Both +line_no+ and the returned index are 1-based.
   """
+  def column(source_file, line_no, trigger)
+
   def column(%__MODULE__{} = source_file, line_no, trigger)
       when is_binary(trigger) or is_atom(trigger) do
     line = line_at(source_file, line_no)
@@ -111,10 +135,4 @@ defmodule Credo.SourceFile do
   end
 
   def column(_, _, _), do: nil
-
-  defimpl Inspect, for: __MODULE__ do
-    def inspect(source_file, _opts) do
-      "%SourceFile<#{source_file.filename}>"
-    end
-  end
 end
diff --git a/mix.exs b/mix.exs
index 538a42a6e..0b8d3c2c4 100644
--- a/mix.exs
+++ b/mix.exs
@@ -44,7 +44,8 @@ defmodule Credo.Mixfile do
     [
       {:bunt, "~> 0.2.0"},
       {:jason, "~> 1.0"},
-      {:ex_doc, "~> 0.16", only: :dev, runtime: false}
+      {:ex_doc, "~> 0.16", only: :dev, runtime: false},
+      {:inch_ex, "~> 0.1", only: [:dev, :test], runtime: false}
     ]
   end
 end
diff --git a/mix.lock b/mix.lock
index 985ff9ba4..bffb6f4f8 100644
--- a/mix.lock
+++ b/mix.lock
@@ -2,5 +2,7 @@
   "bunt": {:hex, :bunt, "0.2.0", "951c6e801e8b1d2cbe58ebbd3e616a869061ddadcc4863d0a2182541acae9a38", [:mix], []},
   "earmark": {:hex, :earmark, "1.2.4", "99b637c62a4d65a20a9fb674b8cffb8baa771c04605a80c911c4418c69b75439", [:mix], [], "hexpm"},
   "ex_doc": {:hex, :ex_doc, "0.18.3", "f4b0e4a2ec6f333dccf761838a4b253d75e11f714b85ae271c9ae361367897b7", [:mix], [{:earmark, "~> 1.1", [hex: :earmark, repo: "hexpm", optional: false]}], "hexpm"},
+  "inch_ex": {:hex, :inch_ex, "0.5.6", "418357418a553baa6d04eccd1b44171936817db61f4c0840112b420b8e378e67", [:mix], [{:poison, "~> 1.5 or ~> 2.0 or ~> 3.0", [hex: :poison, repo: "hexpm", optional: false]}], "hexpm"},
   "jason": {:hex, :jason, "1.0.0", "0f7cfa9bdb23fed721ec05419bcee2b2c21a77e926bce0deda029b5adc716fe2", [:mix], [{:decimal, "~> 1.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm"},
+  "poison": {:hex, :poison, "3.1.0", "d9eb636610e096f86f25d9a46f35a9facac35609a7591b3be3326e99a0484665", [:mix], [], "hexpm"},
 }
diff --git a/test/credo/check/config_comment_finder_test.exs b/test/credo/check/config_comment_finder_test.exs
index 48500d476..657e04f87 100644
--- a/test/credo/check/config_comment_finder_test.exs
+++ b/test/credo/check/config_comment_finder_test.exs
@@ -1,8 +1,6 @@
 defmodule Credo.Check.ConfigCommentFinderTest do
   use Credo.TestHelper
 
-  use Credo.TestHelper
-
   alias Credo.Check.ConfigCommentFinder
 
   test "it should report the correct scope" do
diff --git a/test/credo/check/params_test.exs b/test/credo/check/params_test.exs
new file mode 100644
index 000000000..c0234c62c
--- /dev/null
+++ b/test/credo/check/params_test.exs
@@ -0,0 +1,5 @@
+defmodule Credo.Check.ParamsTest do
+  use Credo.TestHelper
+
+  doctest Credo.Check.Params
+end
diff --git a/test/credo/cli/options_test.exs b/test/credo/cli/options_test.exs
index 2c21548e1..ba141f74d 100644
--- a/test/credo/cli/options_test.exs
+++ b/test/credo/cli/options_test.exs
@@ -5,6 +5,8 @@ defmodule Credo.CLI.OptionsTest do
   @command_names ["cmd1", "cmd2", "cmd3"]
   @fixture_name "options"
 
+  doctest Credo.CLI.Options
+
   defp fixture_path(name) do
     Path.join([File.cwd!(), "test", "fixtures", name])
   end