def get_parser(self, prog_name):
        parser = super(ListUser, self).get_parser(prog_name)
        parser.add_argument(
            '--domain',
            metavar='<domain>',
            help='Filter users by <domain> (name or ID)',
        )
        project_or_group = parser.add_mutually_exclusive_group()
        project_or_group.add_argument(
            '--group',
            metavar='<group>',
            help='Filter users by <group> membership (name or ID)',
        )
        project_or_group.add_argument(
            '--project',
            metavar='<project>',
            help='Filter users by <project> (name or ID)',
        )
        parser.add_argument(
            '--long',
            action='store_true',
            default=False,
            help='List additional fields in output',
        )
        return parser