GNU bug report logs - #29241
"The file specified to gunzip has not been compressed"

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From: =?utf-8?B?56mN5Li55bC8?= Dan Jacobson <jidanni@HIDDEN>
To: bug-gzip@HIDDEN
Subject: "The file specified to gunzip has not been compressed"
Date: Fri, 10 Nov 2017 13:58:46 +0800
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man page says
DIAGNOSTICS
       file: not in gzip format
              The file specified to gunzip has not been compressed.

Please add something like:
"...or yes, compressed, but not by gzip or a program gzip is familiar with."