diff --git a/src/hb-ft.cc b/src/hb-ft.cc
index 23c2cc032..da5a4b460 100644
--- a/src/hb-ft.cc
+++ b/src/hb-ft.cc
@@ -61,6 +61,8 @@
  *     provide any API to get to the transform/delta set on the face. :(
  *
  *   - Always use FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH?
+ *
+ *   - FT_Load_Glyph() is exteremely costly.  Do something about it?
  */