diff --git a/external/harfbuzz/UnpackedTarball_harfbuzz.mk b/external/harfbuzz/UnpackedTarball_harfbuzz.mk
index 48d7b450bc3a..8101f244f4df 100644
--- a/external/harfbuzz/UnpackedTarball_harfbuzz.mk
+++ b/external/harfbuzz/UnpackedTarball_harfbuzz.mk
@@ -15,6 +15,8 @@ $(eval $(call gb_UnpackedTarball_update_autoconf_configs,harfbuzz))
 
 $(eval $(call gb_UnpackedTarball_set_patchlevel,harfbuzz,0))
 
+# * external/harfbuzz/msvc.patch sent upstream as <https://github.com/harfbuzz/harfbuzz/pull/1605>
+#   "Fix hb_atomic_* variants based on C++11 atomics":
 $(eval $(call gb_UnpackedTarball_add_patches,harfbuzz, \
     external/harfbuzz/msvc.patch \
 ))