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-rw-r--r--doc/emacs/files.texi5
1 files changed, 3 insertions, 2 deletions
diff --git a/doc/emacs/files.texi b/doc/emacs/files.texi
index 7221edcc1b2..f5dd408cc9f 100644
--- a/doc/emacs/files.texi
+++ b/doc/emacs/files.texi
@@ -690,8 +690,9 @@ non-@code{nil} (the default is @code{t}), and renaming would change
the file's owner or group, use copying.
If you change @code{backup-by-copying-when-mismatch} to @code{nil},
-Emacs checks the numeric user-id of the file's owner. If this is
-higher than @code{backup-by-copying-when-privileged-mismatch}, then it
+Emacs checks the numeric user-id of the file's owner and the numeric
+group-id of the file's group. If either is
+no greater than @code{backup-by-copying-when-privileged-mismatch}, then it
behaves as though @code{backup-by-copying-when-mismatch} is
non-@code{nil} anyway.