diff --git a/ANNOUNCE b/ANNOUNCE
index 5b03ea1d7..0e3d3163e 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -512,6 +512,7 @@ version 1.4.0beta69 [July 25, 2009]
 
 version 1.4.0beta70 [July 28, 2009]
   Avoid a possible NULL dereference in debug build, in png_set_text_2().
+    (bug introduced in libpng-0.95, discovered by Evan Rouault)
 
 version 1.4.0betaN [future]
   Build shared libraries with -lz and sometimes -lm.
diff --git a/CHANGES b/CHANGES
index 18a39bc92..dc0e8a9d6 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2191,6 +2191,7 @@ version 1.4.0beta69 [July 25, 2009]
 
 version 1.4.0beta70 [July 28, 2009]
   Avoid a possible NULL dereference in debug build, in png_set_text_2().
+    (bug introduced in libpng-0.95, discovered by Evan Rouault)
 
 version 1.4.0betaN [future]
   Build shared libraries with -lz and sometimes -lm.