diff --git a/ANNOUNCE b/ANNOUNCE
index 5242b600f..b85a4265d 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -85,6 +85,7 @@ Version 1.6.0beta04 [December 24, 2011]
     it was disabled whenever internal fixed point arithmetic was selected,
     which meant it didn't exist even on systems where FP was available but not
     preferred.
+  Added pngvalid.c compile time checks for const APIs.
 
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diff --git a/CHANGES b/CHANGES
index a0623d6f4..fda564a49 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3836,6 +3836,7 @@ Version 1.6.0beta04 [December 24, 2011]
     it was disabled whenever internal fixed point arithmetic was selected,
     which meant it didn't exist even on systems where FP was available but not
     preferred.
+  Added pngvalid.c compile time checks for const APIs.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit