diff --git a/keystonemiddleware/auth_token/__init__.py b/keystonemiddleware/auth_token/__init__.py
index 88360b90..f00ad9fc 100644
--- a/keystonemiddleware/auth_token/__init__.py
+++ b/keystonemiddleware/auth_token/__init__.py
@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""
+r"""
 Token-based Authentication Middleware.
 
 This WSGI component:
diff --git a/keystonemiddleware/auth_token/_cache.py b/keystonemiddleware/auth_token/_cache.py
index 9cd5b00b..001721a4 100644
--- a/keystonemiddleware/auth_token/_cache.py
+++ b/keystonemiddleware/auth_token/_cache.py
@@ -84,6 +84,7 @@ class _CachePool(list):
 
 class _MemcacheClientPool(object):
     """An advanced memcached client pool that is eventlet safe."""
+
     def __init__(self, memcache_servers, **kwargs):
         self._pool = memcache_pool.MemcacheClientPool(memcache_servers,
                                                       **kwargs)
diff --git a/keystonemiddleware/auth_token/_memcache_crypt.py b/keystonemiddleware/auth_token/_memcache_crypt.py
index 0efe0b72..28183651 100644
--- a/keystonemiddleware/auth_token/_memcache_crypt.py
+++ b/keystonemiddleware/auth_token/_memcache_crypt.py
@@ -56,6 +56,7 @@ class InvalidMacError(Exception):
     This usually indicates that data had been expectedly modified in memcache.
 
     """
+
     pass
 
 
@@ -63,6 +64,7 @@ class DecryptError(Exception):
     """raise when unable to decrypt encrypted data.
 
     """
+
     pass
 
 
@@ -70,6 +72,7 @@ class CryptoUnavailableError(Exception):
     """raise when Python Crypto module is not available.
 
     """
+
     pass
 
 
diff --git a/keystonemiddleware/auth_token/_memcache_pool.py b/keystonemiddleware/auth_token/_memcache_pool.py
index ed844f8d..de0d3c37 100644
--- a/keystonemiddleware/auth_token/_memcache_pool.py
+++ b/keystonemiddleware/auth_token/_memcache_pool.py
@@ -42,6 +42,7 @@ class ConnectionPool(queue.Queue):
     This class implements the basic connection pool logic as an abstract base
     class.
     """
+
     def __init__(self, maxsize, unused_timeout, conn_get_timeout=None):
         """Initialize the connection pool.
 
diff --git a/keystonemiddleware/echo/service.py b/keystonemiddleware/echo/service.py
index 4824f778..4b931626 100644
--- a/keystonemiddleware/echo/service.py
+++ b/keystonemiddleware/echo/service.py
@@ -41,6 +41,7 @@ def echo_app(environ, start_response):
 
 class EchoService(object):
     """Runs an instance of the echo app on init."""
+
     def __init__(self):
         # hardcode any non-default configuration here
         conf = {'auth_protocol': 'http', 'admin_token': 'ADMIN'}
diff --git a/keystonemiddleware/tests/unit/auth_token/test_auth_token_middleware.py b/keystonemiddleware/tests/unit/auth_token/test_auth_token_middleware.py
index 6493422b..628de092 100644
--- a/keystonemiddleware/tests/unit/auth_token/test_auth_token_middleware.py
+++ b/keystonemiddleware/tests/unit/auth_token/test_auth_token_middleware.py
@@ -264,6 +264,7 @@ class BaseAuthTokenMiddlewareTest(base.BaseAuthTokenTestCase):
     this to specify, for instance, v3 format.
 
     """
+
     def setUp(self, expected_env=None, auth_version=None, fake_app=None):
         super(BaseAuthTokenMiddlewareTest, self).setUp()
 
diff --git a/keystonemiddleware/tests/unit/test_ec2_token_middleware.py b/keystonemiddleware/tests/unit/test_ec2_token_middleware.py
index 19d79d2e..51915026 100644
--- a/keystonemiddleware/tests/unit/test_ec2_token_middleware.py
+++ b/keystonemiddleware/tests/unit/test_ec2_token_middleware.py
@@ -41,6 +41,7 @@ class FakeResponse(object):
 
 class FakeApp(object):
     """This represents a WSGI app protected by the auth_token middleware."""
+
     def __call__(self, env, start_response):
         resp = webob.Response()
         resp.environ = env
diff --git a/keystonemiddleware/tests/unit/test_s3_token_middleware.py b/keystonemiddleware/tests/unit/test_s3_token_middleware.py
index b0993886..23641b81 100644
--- a/keystonemiddleware/tests/unit/test_s3_token_middleware.py
+++ b/keystonemiddleware/tests/unit/test_s3_token_middleware.py
@@ -30,6 +30,7 @@ GOOD_RESPONSE = {'access': {'token': {'id': 'TOKEN_ID',
 
 class FakeApp(object):
     """This represents a WSGI app protected by the auth_token middleware."""
+
     def __call__(self, env, start_response):
         resp = webob.Response()
         resp.environ = env
diff --git a/tox.ini b/tox.ini
index 8ce07231..f2e45f04 100644
--- a/tox.ini
+++ b/tox.ini
@@ -43,10 +43,7 @@ commands = oslo_debug_helper {posargs}
 # D105: Missing docstring in magic method
 # D200: One-line docstring should fit on one line with quotes
 # D202: No blank lines allowed after function docstring
-# D204: 1 blank line required after class docstring
-# D209: Multi-line docstring closing quotes should be on a separate line
-# D301: Use r""" if any backslashes in a docstring
-ignore = D100,D101,D102,D103,D104,D105,D200,D202,D209,D301,D204
+ignore = D100,D101,D102,D103,D104,D105,D200,D202
 show-source = True
 exclude = .venv,.tox,dist,doc,*egg,build,*openstack/common*