diff --git a/keystonemiddleware/tests/unit/utils.py b/keystonemiddleware/tests/unit/utils.py
index d5c49301..0d2008ae 100644
--- a/keystonemiddleware/tests/unit/utils.py
+++ b/keystonemiddleware/tests/unit/utils.py
@@ -98,6 +98,11 @@ class TestResponse(requests.Response):
             self.status_code = data
 
     def __eq__(self, other):
+        """Test if the response is equivalent to another response.
+
+        This works by comparing the attribute dictionaries of both TestResponse
+        instances.
+        """
         return self.__dict__ == other.__dict__
 
     @property
diff --git a/tox.ini b/tox.ini
index ad790a98..dbd21b0e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -40,8 +40,7 @@ commands = oslo_debug_helper {posargs}
 # D102: Missing docstring in public method
 # D103: Missing docstring in public function
 # D104: Missing docstring in public package
-# D105: Missing docstring in magic method
-ignore = D100,D101,D102,D103,D104,D105
+ignore = D100,D101,D102,D103,D104
 show-source = True
 exclude = .venv,.tox,dist,doc,*egg,build,*openstack/common*