(revert-buffer): Doc fix.

diff --git a/lisp/files.el b/lisp/files.el
index 436aa8509c4064eb821aec15ea8517c5f475d610..154ec33098cf0a027d0a4600719cb682bf024095 100644 (file)
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -2180,6 +2180,9 @@ to nil.
 Optional second argument NOCONFIRM means don't ask for confirmation at
 all.
 
+Optional third argument PRESERVE-MODES non-nil means don't alter
+the files modes.  Normally we reinitialize them using `normal-mode'.
+
 If the value of `revert-buffer-function' is non-nil, it is called to
 do the work.