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Don't say that the .lz format allows trailing data. According to the lzip 1.25 manual, trailing data isn't part of the file format at all. However, tools are still expected to behave as usefully as possible when there is trailing data. Fix the description of lzip >= 1.20 behavior when some of the first bytes of trailing data match the magic bytes. While the lzip 1.25 manual recommends that none of the first four bytes in trailing data should match the magic bytes, the default behavior of lzip 1.25 treats trailing data as a corrupt member header only if two or three bytes match the magic bytes; one matching byte isn't enough. Reported-by: Antonio Diaz Diaz Link: https://www.mail-archive.com/xz-devel@tukaani.org/msg00702.html