--- a/hgext/children.py	Wed Jun 09 12:45:48 2010 +0100
+++ b/hgext/children.py	Sun Jun 06 17:25:00 2010 +0900
@@ -38,7 +38,8 @@
 cmdtable = {
     "children":
         (children,
-         [('r', 'rev', '', _('show children of the specified revision')),
+         [('r', 'rev', '',
+           _('show children of the specified revision'), _('REV')),
          ] + templateopts,
          _('hg children [-r REV] [FILE]')),
 }