diff --git a/ANNOUNCE b/ANNOUNCE
index 6b6ae256cd2c6583d90907e04f6066230c580abb..f71624e00ac2c0474aa40f57655adf9ee9bdb1d1 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 1b72610294a4e95da3ea052344c760259059c94d..771a35174cbe579a45c546b9ff42091865a1fb7e 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