From f9e5cb0ad3a19e7c630d469720ec3576e5c17514 Mon Sep 17 00:00:00 2001
From: Eli Zaretskii <eliz@gnu.org>
Date: Sat, 5 Oct 2013 20:38:22 +0300
Subject: [PATCH] Improve commentary.

---
 src/menu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/menu.c b/src/menu.c
index c3ab358bebf..447faf60b1f 100644
--- a/src/menu.c
+++ b/src/menu.c
@@ -1087,6 +1087,9 @@ into menu items.  */)
       /* Find the menu bar item under `col'.  */
       item = Qnil;
       items = FRAME_MENU_BAR_ITEMS (f);
+      /* This loop assumes a single menu-bar line, and will fail to
+	 find an item if it is not in the first line.  Note that
+	 make_lispy_event in keyboard.c makes the same assumption.  */
       for (i = 0; i < ASIZE (items); i += 4)
 	{
 	  Lisp_Object pos, str;
-- 
2.39.2