def add_arguments(parser):
    """
        Adds arguments to overall program's parser.
    """
    parser.add_argument('--bound', default=None, type=float, help=
        '[Default is None] Decision boundary for belief.')
    parser.add_argument('--orthotrustfactor', default=0.85, type=float,
        help=
        '[Default is 0.85] Trust factor (decay) in belief for orthologue nodes.'
        )
    parser.add_argument('--paratrustfactor', default=0.7225, type=float,
        help=
        '[Default is 0.7225] Trust factor (decay) in belief for paralogue nodes.'
        )
