diff --git a/ANNOUNCE b/ANNOUNCE
index e49bb717a..9126b3c65 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.7.0beta66 - September 22, 2015
+Libpng 1.7.0beta66 - September 25, 2015
 
 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.
@@ -871,7 +871,7 @@ Version 1.7.0beta65 [September 16, 2015]
     (but not yet by the writer) (John Bowler).
   Implemented shared transform handling that is used throughout (John Bowler).
 
-Version 1.7.0beta66 [September 22, 2015]
+Version 1.7.0beta66 [September 25, 2015]
   Enabled the low-bit-depth gray tests that were disabled in prior versions
     of libpng because of problems that should have been fixed by the recent
     changes to libpng17. Enabling the tests revealed bugs in those changes
@@ -929,6 +929,10 @@ Version 1.7.0beta66 [September 22, 2015]
   Added test files generated by "contrib/testpngs/makepngs.sh --small"
     with MAKEPNG set to the makepng compiled from the current
     contrib/libtests/makepngs.sh, to the "contrib/testpngs" directory.
+  Made png_rgb_to_gray() optimization fixes.  This fixes the code
+    that optimizes RGB to Gray transformations that only selected on
+    channel and clarifies the handling of max_depth in the transform
+    code.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index 6c54176d8..6753ed885 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5170,7 +5170,7 @@ Version 1.7.0beta65 [September 16, 2015]
     (but not yet by the writer) (John Bowler).
   Implemented shared transform handling that is used throughout (John Bowler).
 
-Version 1.7.0beta66 [September 22, 2015]
+Version 1.7.0beta66 [September 25, 2015]
   Enabled the low-bit-depth gray tests that were disabled in prior versions
     of libpng because of problems that should have been fixed by the recent
     changes to libpng17. Enabling the tests revealed bugs in those changes
@@ -5228,6 +5228,10 @@ Version 1.7.0beta66 [September 22, 2015]
   Added test files generated by "contrib/testpngs/makepngs.sh --small"
     with MAKEPNG set to the makepng compiled from the current
     contrib/libtests/makepngs.sh, to the "contrib/testpngs" directory.
+  Made png_rgb_to_gray() optimization fixes.  This fixes the code
+    that optimizes RGB to Gray transformations that only selected on
+    channel and clarifies the handling of max_depth in the transform
+    code.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit