diff --git a/magnum/api/controllers/v1.py b/magnum/api/controllers/v1.py
index d229001f28..70cd0ff47d 100644
--- a/magnum/api/controllers/v1.py
+++ b/magnum/api/controllers/v1.py
@@ -153,6 +153,8 @@ class Query(_Base):
 
 
 class Container(_Base):
+    """Controller Model."""
+
     container_id = wtypes.text
     """ The ID of the containers."""