diff --git a/mistralclient/osc/plugin.py b/mistralclient/osc/plugin.py
index 1952d6df..f922e440 100644
--- a/mistralclient/osc/plugin.py
+++ b/mistralclient/osc/plugin.py
@@ -11,6 +11,8 @@
 #    See the License for the specific language governing permissions and
 #    limitations under the License.
 
+"""OpenStackClient plugin for Workflow service."""
+
 import logging
 
 from osc_lib import utils