diff --git a/ANNOUNCE b/ANNOUNCE
index 11b301a94..ad5cc0837 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,4 +1,4 @@
-Libpng 1.6.33beta01 - August 28, 2017
+Libpng 1.6.33beta01 - August 29, 2017
 
 This is not intended to be a public release. It will be replaced
 within a few weeks by a public version or by another test version.
@@ -26,6 +26,8 @@ Other information:
 Changes since the last public release (1.6.32):
   Added PNGMINUS_UNUSED macro to contrib/pngminus/p*.c and added missing
     parenthesis in contrib/pngminus/pnm2png.c (bug report by Christian Hesse).
+  Fixed off-by-one error in png_do_check_palette_indexes() (Bug report
+    by Mick P., Source Forge Issue #269).
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index 521d89d35..ea1e07bf5 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5994,9 +5994,11 @@ Version 1.6.32rc02 [August 22, 2017]
 Version 1.6.32 [August 24, 2017]
   No changes.
 
-Version 1.6.33beta01 [August 28, 2017]
+Version 1.6.33beta01 [August 29, 2017]
   Added PNGMINUS_UNUSED macro to contrib/pngminus/p*.c and added missing
     parenthesis in contrib/pngminus/pnm2png.c (bug report by Christian Hesse).
+  Fixed off-by-one error in png_do_check_palette_indexes() (Bug report
+    by Mick P., Source Forge Issue #269).
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit