From 0875a420f7e04a27971b6b69a3364ba3eff9ed0b Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Wed, 4 Jan 2023 13:11:37 -0700
Subject: [PATCH] [map] Doc

---
 src/hb-map.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/hb-map.cc b/src/hb-map.cc
index fd7f3e371..dec429a46 100644
--- a/src/hb-map.cc
+++ b/src/hb-map.cc
@@ -352,6 +352,8 @@ hb_map_hash (const hb_map_t *map)
  *
  * Set @idx to -1 to get started.
  *
+ * If the map is modified during iteration, the behavior is undefined.
+ *
  * Return value: `true` if there was a next value, `false` otherwise
  *
  * Since: REPLACEME