def get_desc():
    """
    Get description for help text

    Parameters
    ----------
    no inputs

    Returns
    -------
    a string with contains the description
    """
    return """Converts the postions of variants and ignored/missing positions in either a 'raw' or filtered VCF
              file to a json string and writes it to a file.
              The json contains 6 arrays for each chromosome in the VCF file:
              g_positions, a_positions, t_positions, c_positions, gap_positions, n_positions
           """
