diff --git a/src/AccessControl/interfaces.py b/src/AccessControl/interfaces.py
index 0372ea3..29a17f2 100644
--- a/src/AccessControl/interfaces.py
+++ b/src/AccessControl/interfaces.py
@@ -211,7 +211,7 @@ def getUsers():
         """
 
     def getUserNames():
-        """Get a sequence of names of the users which reside in the user folder.
+        """Get a sequence of all names of the users in the user folder.
         """