def provider_parser(subparser):
    """Configure provider parser for Henet."""
    subparser.description = """A provider for Hurricane Electric DNS.
        NOTE: THIS DOES NOT WORK WITH 2-FACTOR AUTHENTICATION.
              YOU MUST DISABLE IT IF YOU'D LIKE TO USE THIS PROVIDER.
        """
    subparser.add_argument('--auth-username', help=
        'specify username for authentication')
    subparser.add_argument('--auth-password', help=
        'specify password for authentication')
