From a10ff20562f9a77b2f1510bdb70a70f3d2699f1c Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Wed, 16 Nov 2022 13:34:37 -0700
Subject: [PATCH] [ft] Comment

---
 src/hb-ft.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hb-ft.cc b/src/hb-ft.cc
index 1626b9a15..3892dedc1 100644
--- a/src/hb-ft.cc
+++ b/src/hb-ft.cc
@@ -89,7 +89,7 @@ struct hb_ft_font_t
   bool unref; /* Whether to destroy ft_face when done. */
   bool transform; /* Whether to apply FT_Face's transform. */
 
-  mutable hb_mutex_t lock;
+  mutable hb_mutex_t lock; /* Protects members below. */
   FT_Face ft_face;
   mutable unsigned cached_serial;
   mutable hb_ft_advance_cache_t advance_cache;