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-rw-r--r--doc/guix.texi3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 6d64772262..0d72574619 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -5609,7 +5609,8 @@ guix challenge @var{options} [@var{packages}@dots{}]
 When a difference is found between the hash of a locally-built item and
 that of a server-provided substitute, or among substitutes provided by
 different servers, the command displays it as in the example above and
-exits with a non-zero return code.
+its exit code is 2 (other non-zero exit codes denote other kinds of
+errors.)
 
 The one option that matters is: