diff -r 4f5a6df2af92 -r 0e789549271d mercurial/commands.py
--- a/mercurial/commands.py	Sun Jul 18 01:06:50 2010 +0900
+++ b/mercurial/commands.py	Wed Jul 14 18:28:12 2010 -0400
@@ -3779,8 +3779,8 @@
     Update the repository's working directory to the specified
     changeset.
 
-    If no changeset is specified, attempt to update to the head of the
-    current branch. If this head is a descendant of the working
+    If no changeset is specified, attempt to update to the tip of the
+    current branch. If this changeset is a descendant of the working
     directory's parent, update to it, otherwise abort.
 
     The following rules apply when the working directory contains