def METHOD_NAME(self):
    mbupdate = Subcommand('mbupdate',
                          help='Update MusicBrainz collection')
    mbupdate.parser.add_option('-r', '--remove',
                               action='store_true',
                               default=None,
                               dest='remove',
                               help='Remove albums not in beets library')
    mbupdate.func = self.update_collection
    return [mbupdate]