From 2f1747ed7d28148807ad07eb8e22db3ab5c54966 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Thu, 16 Aug 2012 11:46:46 -0400
Subject: [PATCH] Add comment

---
 src/hb-ot-shape-complex-arabic.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/hb-ot-shape-complex-arabic.cc b/src/hb-ot-shape-complex-arabic.cc
index 3e61e697f..857bf559c 100644
--- a/src/hb-ot-shape-complex-arabic.cc
+++ b/src/hb-ot-shape-complex-arabic.cc
@@ -202,6 +202,10 @@ struct arabic_shape_plan_t
   ASSERT_POD ();
 
   bool do_fallback;
+  /* The "+ 1" in the next array is to accommodate for the "NONE" command,
+   * which is not an OpenType feature, but this simplifies the code by not
+   * having to do a "if (... < NONE) ..." and just rely on the fact that
+   * mask_array[NONE] == 0. */
   hb_mask_t mask_array[ARABIC_NUM_FEATURES + 1];
 };