def edit_header(my_vcf):
    """
    Add INFO for new fields to vcf
    """
    header = my_vcf.header.copy()
    header.add_line(('##INFO=<ID=TruScore,Number=1,Type=Integer,'
                     'Description="Truvari score for similarity of match">'))
    header.add_line(('##INFO=<ID=PctSeqSimilarity,Number=1,Type=Float,'
                     'Description="Pct sequence similarity between this variant and its closest match">'))
    header.add_line(('##INFO=<ID=PctSizeSimilarity,Number=1,Type=Float,'
                     'Description="Pct size similarity between this variant and its closest match">'))
    header.add_line(('##INFO=<ID=PctRecOverlap,Number=1,Type=Float,'
                     'Description="Percent reciprocal overlap percent of the two calls\' coordinates">'))
    header.add_line(('##INFO=<ID=StartDistance,Number=1,Type=Integer,'
                     'Description="Distance of the base call\'s end from comparison call\'s start">'))
    header.add_line(('##INFO=<ID=EndDistance,Number=1,Type=Integer,'
                     'Description="Distance of the base call\'s end from comparison call\'s end">'))
    header.add_line(('##INFO=<ID=SizeDiff,Number=1,Type=Float,'
                     'Description="Difference in size of base and comp calls">'))
    header.add_line(('##INFO=<ID=GTMatch,Number=0,Type=Flag,'
                     'Description="Base/Comparison Genotypes match">'))
    header.add_line(('##INFO=<ID=MatchId,Number=1,Type=String,'
                     'Description="Id to help tie base/comp calls together {chunkid}.{baseid}.{compid}">'))
    header.add_line(('##INFO=<ID=Multi,Number=0,Type=Flag,'
                     'Description="Call is false due to non-multimatching">'))
    return header