diff --git a/tests/fixtures/config_files/README.rst b/tests/fixtures/config_files/README.rst
index b69e080..b00adad 100644
--- a/tests/fixtures/config_files/README.rst
+++ b/tests/fixtures/config_files/README.rst
@@ -20,3 +20,19 @@ Purposes of existing fixtures
 
     This should only be used when providing config file(s) specified by the
     user on the command-line.
+
+``tests/fixtures/config_files/local-config.ini``
+
+    This should be used when providing config files that would have been found
+    by looking for config files in the current working project directory.
+
+
+``tests/fixtures/config_files/no-flake8-section.ini``
+
+    This should be used when parsing an ini file without a ``[flake8]``
+    section.
+
+``tests/fixtures/config_files/user-config.ini``
+
+    This is an example configuration file that would be found in the user's
+    home directory (or XDG Configuration Directory).