diff --git a/Lib/poplib.py b/Lib/poplib.py
index 1a1629d175b..beb93a0d57c 100644
--- a/Lib/poplib.py
+++ b/Lib/poplib.py
@@ -309,7 +309,7 @@ def close(self):
     # optional commands:
 
     def rpop(self, user):
-        """Not sure what this does."""
+        """Send RPOP command to access the mailbox with an alternate user."""
         return self._shortcmd('RPOP %s' % user)