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diff --git a/doc/guix.texi b/doc/guix.texi
index cd4e550ef3..4222e011e5 100644
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@@ -998,6 +998,10 @@ consecutive build results are not bit-for-bit identical. Note that this
setting can be overridden by clients such as @command{guix build}
(@pxref{Invoking guix build}).
+When used in conjunction with @option{--keep-failed}, the differing
+output is kept in the store, under @file{/gnu/store/@dots{}-check}.
+This makes it easy to look for differences between the two results.
+
@item --debug
Produce debugging output.