diff -r e4274f9f97c8 -r 40c06bbf58be hgext/extdiff.py
--- a/hgext/extdiff.py	Wed Jun 09 12:45:48 2010 +0100
+++ b/hgext/extdiff.py	Sun Jun 06 17:25:00 2010 +0900
@@ -259,10 +259,14 @@
 cmdtable = {
     "extdiff":
     (extdiff,
-     [('p', 'program', '', _('comparison program to run')),
-      ('o', 'option', [], _('pass option to comparison program')),
-      ('r', 'rev', [], _('revision')),
-      ('c', 'change', '', _('change made by revision')),
+     [('p', 'program', '',
+       _('comparison program to run'), _('CMD')),
+      ('o', 'option', [],
+       _('pass option to comparison program'), _('OPT')),
+      ('r', 'rev', [],
+       _('revision'), _('REV')),
+      ('c', 'change', '',
+       _('change made by revision'), _('REV')),
      ] + commands.walkopts,
      _('hg extdiff [OPT]... [FILE]...')),
     }