diff --git a/libpng-manual.txt b/libpng-manual.txt
index 7452795af..bddb0781a 100644
--- a/libpng-manual.txt
+++ b/libpng-manual.txt
@@ -1,6 +1,6 @@
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.5.3beta08 - May 13, 2011
+ libpng version 1.5.3beta08 - May 16, 2011
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.5.3beta08 - May 13, 2011
+ libpng versions 0.97, January 1998, through 1.5.3beta08 - May 16, 2011
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
 
@@ -1489,8 +1489,7 @@ Within the matrix,
          png_set_expand_gray_1_2_4_to_8() (and by png_set_expand() if there
          is no transparency in the original or the final format).
      "C" means the transformation is obtained by png_set_gray_to_rgb().
-     "G" means the transformation is obtained by png_set_rgb_to_gray() or
-         png_set_rgb_to_Y().
+     "G" means the transformation is obtained by png_set_rgb_to_gray().
      "P" means the transformation is obtained by
          png_set_expand_palette_to_rgb().
      "p" means the transformation is obtained by png_set_packing().
@@ -4401,7 +4400,7 @@ Other rules can be inferred by inspecting the libpng source.
 
 XIV. Y2K Compliance in libpng
 
-May 13, 2011
+May 16, 2011
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
diff --git a/libpng.3 b/libpng.3
index aacc3c539..255e0673a 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,4 +1,4 @@
-.TH LIBPNG 3 "May 13, 2011"
+.TH LIBPNG 3 "May 16, 2011"
 .SH NAME
 libpng \- Portable Network Graphics (PNG) Reference Library 1.5.3beta08
 .SH SYNOPSIS
@@ -951,7 +951,7 @@ Following is a copy of the libpng-manual.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.5.3beta08 - May 13, 2011
+ libpng version 1.5.3beta08 - May 16, 2011
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -962,7 +962,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.5.3beta08 - May 13, 2011
+ libpng versions 0.97, January 1998, through 1.5.3beta08 - May 16, 2011
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
 
@@ -2440,8 +2440,7 @@ Within the matrix,
          png_set_expand_gray_1_2_4_to_8() (and by png_set_expand() if there
          is no transparency in the original or the final format).
      "C" means the transformation is obtained by png_set_gray_to_rgb().
-     "G" means the transformation is obtained by png_set_rgb_to_gray() or
-         png_set_rgb_to_Y().
+     "G" means the transformation is obtained by png_set_rgb_to_gray().
      "P" means the transformation is obtained by
          png_set_expand_palette_to_rgb().
      "p" means the transformation is obtained by png_set_packing().
@@ -5352,7 +5351,7 @@ Other rules can be inferred by inspecting the libpng source.
 
 .SH XIV. Y2K Compliance in libpng
 
-May 13, 2011
+May 16, 2011
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
@@ -5604,7 +5603,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.5.3beta08 - May 13, 2011:
+Libpng version 1.5.3beta08 - May 16, 2011:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -5627,7 +5626,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.5.3beta08, May 13, 2011, are
+libpng versions 1.2.6, August 15, 2004, through 1.5.3beta08, May 16, 2011, are
 Copyright (c) 2004,2006-2007 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
@@ -5726,7 +5725,7 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-May 13, 2011
+May 16, 2011
 
 .\" end of man page