def METHOD_NAME(parser):
    parser.add_argument('--all', action='store_true',
                        help=_("search also package description and URL"))
    parser.add_argument('query_string', nargs='+', metavar=_('KEYWORD'),
                        choices=['all'], default=None,
                        action=OptionParser.PkgNarrowCallback,
                        help=_("Keyword to search for"))