diff --git a/nova/availability_zones.py b/nova/availability_zones.py
index cb5cce591fab..7493ce5c5ef6 100644
--- a/nova/availability_zones.py
+++ b/nova/availability_zones.py
@@ -13,7 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-"""utilities for multiple APIs."""
+"""Availability zone helper functions."""
 
 from nova import db
 from nova.openstack.common import cfg