def add_parser_arguments(parser):
    """ Add additional subcommands onto this command """
    parser.add_argument('network', metavar='NETWORK', type=str, nargs=1,
        help='Ethereum network to connect the console to')
    parser.add_argument('package', metavar='PACKAGE', type=str, nargs=1,
        help='The EthPM package to install')
    return parser
