diff --git a/ANNOUNCE b/ANNOUNCE
index 0c7e4288f..6f38e5889 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -32,6 +32,8 @@ Version 1.5.1beta01 [January 8, 2011]
     from png_charpp to png_bytepp in png_get_iCCP().  This change happened
     in version 1.5.0beta36 but is not noted in the CHANGES.  Similarly,
     it was changed from png_charpp to png_const_bytepp in png_set_iCCP().
+  Ensure that png_rgb_to_gray ignores palette mapped images,
+  Fixed the failure to handle palette mapped images correctly.
 
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diff --git a/CHANGES b/CHANGES
index 51fe0d3d4..17be0edca 100644
--- a/CHANGES
+++ b/CHANGES
@@ -3148,6 +3148,8 @@ Version 1.5.1beta01 [January 8, 2011]
     from png_charpp to png_bytepp in png_get_iCCP().  This change happened
     in version 1.5.0beta36 but is not noted in the CHANGES.  Similarly,
     it was changed from png_charpp to png_const_bytepp in png_set_iCCP().
+  Ensure that png_rgb_to_gray ignores palette mapped images,
+  Fixed the failure to handle palette mapped images correctly.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit