[devel] Revise references to zlib-libpng license
diff --git a/pngwtran.c b/pngwtran.c
index 5fd0962..a69ad50 100644
--- a/pngwtran.c
+++ b/pngwtran.c
@@ -7,8 +7,8 @@
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
  * This code is released under the zlib-libpng license.
- * For conditions of distribution and use, see copyright notice in png.h
- *
+ * For conditions of distribution and use, see copyright notice, disclaimer,
+ * and license in png.h
  */
 
 #include "png.h"