Added forum reference to recent PNG update.

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@@ -1,7 +1,8 @@
 2011-06-30  6.7.0-11 Glenn Randers-Pehrson <glennrp@image...>
   * Added PNG:compression-level, compression-strategy, and compression-filter
     defines to the PNG encoder.  If these defines are used, they take
-    precedence over the -quality option.
+    precedence over the -quality option (reference.
+http://www.imagemagick.org/discourse-server/viewtopic.php?&f=1&p=73548).
 
 2011-06-30  6.7.0-10 Cristy  <quetzlzacatenango@image...>
   * New version 6.7.0-10.