--- a/hgext/extdiff.py	Tue Jun 26 20:37:15 2007 +0200
+++ b/hgext/extdiff.py	Tue Jun 26 22:38:57 2007 +0200
@@ -189,4 +189,4 @@
             return mydiff
         cmdtable[cmd] = (save(cmd, path, diffopts),
                          cmdtable['extdiff'][1][1:],
-                         _('hg %s [OPT]... [FILE]...') % cmd)
+                         _('hg %s [OPTION]... [FILE]...') % cmd)