--- a/mercurial/commands.py	Wed Aug 08 10:04:02 2012 -0500
+++ b/mercurial/commands.py	Mon Aug 06 10:45:11 2012 +0200
@@ -5772,7 +5772,7 @@
     current named branch and move the current bookmark (see :hg:`help
     bookmarks`).
 
-    Update sets the working directory's parent revison to the specified
+    Update sets the working directory's parent revision to the specified
     changeset (see :hg:`help parents`).
 
     If the changeset is not a descendant or ancestor of the working