def generate_documentation_subparser(subparsers):
    """Generates the subparser for the auto-documentation option."""
    documentation_parser = subparsers.add_parser('docs')
    documentation_parser.set_defaults(action='docs')
    documentation_parser.add_argument('module', metavar='module', help=
        'Name of the module that uses the symmetric object.')
    documentation_parser.add_argument('-f', '--filename', dest='filename',
        default='', help=
        'Name of the file in where to write the documentation.')
    documentation_parser.add_argument('-m', '--markdown', dest='markdown',
        action='store_const', default=False, const=True, help=
        'Generate simpler, human-readable Markdown documentation.')
