diff --git a/stress/tests/hard_reboots.py b/stress/tests/hard_reboots.py
index f35c6de..fe57be1 100644
--- a/stress/tests/hard_reboots.py
+++ b/stress/tests/hard_reboots.py
@@ -11,7 +11,7 @@
 #    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 #    See the License for the specific language governing permissions and
 #    limitations under the License.
-"""Test that reboots random instances in a Nova cluster"""
+"""Test that reboots random instances in a Nova cluster."""
 
 
 from stress.test_servers import *