diff --git a/gcloud/pubsub/iam.py b/gcloud/pubsub/iam.py
index 61f84ab7d21f..8601209634f1 100644
--- a/gcloud/pubsub/iam.py
+++ b/gcloud/pubsub/iam.py
@@ -84,7 +84,7 @@ def domain(domain):
 
     @staticmethod
     def all_users():
-        """Factory method for an member representing all users.
+        """Factory method for a member representing all users.
 
         :rtype: string
         :returns: A member string representing all users.
@@ -93,7 +93,7 @@ def all_users():
 
     @staticmethod
     def authenticated_users():
-        """Factory method for an member representing all authenticated users.
+        """Factory method for a member representing all authenticated users.
 
         :rtype: string
         :returns: A member string representing all authenticated users.