diff --git a/src/hb/aat_layout_morx_table.rs b/src/hb/aat_layout_morx_table.rs
index 1ff084a7..ac62d7ba 100644
--- a/src/hb/aat_layout_morx_table.rs
+++ b/src/hb/aat_layout_morx_table.rs
@@ -46,6 +46,7 @@ pub fn compile_flags(face: &hb_font_t, builder: &hb_aat_map_builder_t) -> Option
                     flags |= feature.enable_flags;
                 }
             }
+            // TODO: Port the following commit: https://github.com/harfbuzz/harfbuzz/commit/2124ad890
         }
 
         map.chain_flags.push(flags);