diff --git a/ceilometer/polling/manager.py b/ceilometer/polling/manager.py
index 74c8e862b5..badf75263b 100644
--- a/ceilometer/polling/manager.py
+++ b/ceilometer/polling/manager.py
@@ -78,7 +78,7 @@ POLLING_OPTS = [
                 default=False,
                 help='Identify project and user names from polled samples. '
                      'By default, collecting these values is disabled due '
-                     'to the fact that it could overwhelm keystone service'
+                     'to the fact that it could overwhelm keystone service '
                      'with lots of continuous requests depending upon the '
                      'number of projects, users and samples polled from '
                      'the environment. While using this feature, it is '