diff --git a/src/hb-ot-shape-complex-indic.cc b/src/hb-ot-shape-complex-indic.cc
index 9824d756f..c230be8be 100644
--- a/src/hb-ot-shape-complex-indic.cc
+++ b/src/hb-ot-shape-complex-indic.cc
@@ -963,7 +963,8 @@ insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED,
 		       hb_font_t *font,
 		       hb_buffer_t *buffer)
 {
-  /* Note: This loop is extra overhead, but should not be measurable. */
+  /* Note: This loop is extra overhead, but should not be measurable.
+   * TODO Use a buffer scratch flag to remove the loop. */
   bool has_broken_syllables = false;
   unsigned int count = buffer->len;
   hb_glyph_info_t *info = buffer->info;