Change header comment

src/main.cc

diff --git a/src/main.cc b/src/main.cc
index 23d1e82..0251759 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -1,7 +1,7 @@
 /*
  * Copyright (C) 2007,2008,2009  Red Hat, Inc.
  *
- *  This is part of HarfBuzz, an OpenType Layout engine library.
+ *  This is part of HarfBuzz, a text shaping library.
  *
  * Permission is hereby granted, without written agreement and without
  * license or royalty fees, to use, copy, modify, and distribute this