diff -r 5314cbb775f6 -r 1aea66b71f4f mercurial/commands.py
--- a/mercurial/commands.py	Wed Dec 22 13:25:00 2010 -0600
+++ b/mercurial/commands.py	Sun Dec 26 00:43:49 2010 +0100
@@ -2034,7 +2034,7 @@
                        'extensions\n'))
 
     def helpextcmd(name):
-        cmd, ext, mod = extensions.disabledcmd(name, ui.config('ui', 'strict'))
+        cmd, ext, mod = extensions.disabledcmd(ui, name, ui.config('ui', 'strict'))
         doc = gettext(mod.__doc__).splitlines()[0]
 
         msg = help.listexts(_("'%s' is provided by the following "