(line-number-mode): Doc fix.

1 files changed, 4 insertions, 1 deletions

diff --git a/lisp/simple.el b/lisp/simple.el
index 4f78df506e3..9e51d95d9bc 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -3245,7 +3245,10 @@ specialization of overwrite-mode, entered by setting the
   "Toggle Line Number mode.
 With arg, turn Line Number mode on iff arg is positive.
 When Line Number mode is enabled, the line number appears
-in the mode line."
+in the mode line.
+
+Line numbers do not appear for very large buffers, see variable
+`line-number-display-limit'."
   (interactive "P")
   (setq line-number-mode
         (if (null arg) (not line-number-mode)