diff --git a/src/hb-ot-shape.cc b/src/hb-ot-shape.cc
index b9754ce63..50f2986c0 100644
--- a/src/hb-ot-shape.cc
+++ b/src/hb-ot-shape.cc
@@ -371,7 +371,6 @@ hb_ot_shape_execute_internal (hb_ot_shape_context_t *c)
 
   /* SUBSTITUTE */
   {
-    /* Mirroring needs to see the original direction */
     hb_mirror_chars (c);
 
     hb_substitute_default (c);