diff --git a/ANNOUNCE b/ANNOUNCE
index 6b6ae256c..f71624e00 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -85,6 +85,7 @@ version 1.5.0beta12 [March 9, 2010]
   Created new pngdebug.h and moved debug definitions there.
 
 version 1.5.0beta13 [March 9, 2010]
+  Protect pngstruct.h, pnginfo.h, and pngdebug.h from being included twice.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
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diff --git a/CHANGES b/CHANGES
index 1b7261029..771a35174 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2562,6 +2562,7 @@ version 1.5.0beta12 [March 9, 2010]
   Created new pngdebug.h and moved debug definitions there.
 
 version 1.5.0beta13 [March 9, 2010]
+  Protect pngstruct.h, pnginfo.h, and pngdebug.h from being included twice.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit