diff --git a/keystonemiddleware/auth_token/_memcache_crypt.py b/keystonemiddleware/auth_token/_memcache_crypt.py
index 9922f6fa..c88418dd 100644
--- a/keystonemiddleware/auth_token/_memcache_crypt.py
+++ b/keystonemiddleware/auth_token/_memcache_crypt.py
@@ -61,17 +61,13 @@ class InvalidMacError(Exception):
 
 
 class DecryptError(Exception):
-    """raise when unable to decrypt encrypted data.
-
-    """
+    """raise when unable to decrypt encrypted data."""
 
     pass
 
 
 class CryptoUnavailableError(Exception):
-    """raise when Python Crypto module is not available.
-
-    """
+    """raise when Python Crypto module is not available."""
 
     pass
 
diff --git a/keystonemiddleware/ec2_token.py b/keystonemiddleware/ec2_token.py
index 83b78097..27375a75 100644
--- a/keystonemiddleware/ec2_token.py
+++ b/keystonemiddleware/ec2_token.py
@@ -15,10 +15,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-"""
-Starting point for routing EC2 requests.
-
-"""
+"""Starting point for routing EC2 requests."""
 
 import hashlib
 import logging
diff --git a/tox.ini b/tox.ini
index c934265b..ad790a98 100644
--- a/tox.ini
+++ b/tox.ini
@@ -41,8 +41,7 @@ commands = oslo_debug_helper {posargs}
 # D103: Missing docstring in public function
 # D104: Missing docstring in public package
 # D105: Missing docstring in magic method
-# D200: One-line docstring should fit on one line with quotes
-ignore = D100,D101,D102,D103,D104,D105,D200
+ignore = D100,D101,D102,D103,D104,D105
 show-source = True
 exclude = .venv,.tox,dist,doc,*egg,build,*openstack/common*