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+About this directory
+====================
+
+The files in this directory are test fixtures for unit and integration tests.  
+Their purpose is described below. Please note the list of file names that can 
+not be created as they are already used by tests.
+
+New fixtures are preferred over updating existing features unless existing 
+tests will fail.
+
+Files that should not be created
+--------------------------------
+
+- ``tests/fixtures/config_files/missing.ini``
+
+Purposes of existing fixtures
+-----------------------------
+
+``tests/fixtures/config_files/cli-specified.ini``
+
+    This should only be used when providing config file(s) specified by the
+    user on the command-line.