diff -r 8d9ec30d58bc mercurial/commands.py
--- a/mercurial/commands.py	Fri Mar 31 10:52:56 2006 -0800
+++ b/mercurial/commands.py	Sat Apr 01 07:13:43 2006 +0200
@@ -2708,7 +2708,9 @@ def undo(ui, repo):
 
     This command is not intended for use on public repositories. Once
     a change is visible for pull by other users, undoing it locally is
-    ineffective.
+    ineffective. Furthemore a race is possible with readers of the
+    repository, for example an ongoing pull from the repository will
+    fail and rollback.
     """
     repo.undo()