[Indic] Minor

src/hb-ot-shape-complex-indic.cc

diff --git a/src/hb-ot-shape-complex-indic.cc b/src/hb-ot-shape-complex-indic.cc
index 2690511..4482dd3 100644
--- a/src/hb-ot-shape-complex-indic.cc
+++ b/src/hb-ot-shape-complex-indic.cc
@@ -372,7 +372,10 @@
 
 	  /* -> or that is not a pre-base reordering Ra,
 	   *
-	   * TODO
+	   * IMPLEMENTATION NOTES:
+	   *
+	   * Our pre-base reordering Ra's are marked POS_BELOW, so will be skipped
+	   * by the logic above already.
 	   */
 
 	  /* -> or arrive at the first consonant. The consonant stopped at will