diff --git a/libpng-manual.txt b/libpng-manual.txt
index f4acf7dfa..bbd33f3e4 100644
--- a/libpng-manual.txt
+++ b/libpng-manual.txt
@@ -1,9 +1,9 @@
 Libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.5.15beta05 - February 15, 2013
+ libpng version 1.5.15beta05 - February 17, 2013
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
- Copyright (c) 1998-2012 Glenn Randers-Pehrson
+ Copyright (c) 1998-2013 Glenn Randers-Pehrson
 
  This document is released under the libpng license.
  For conditions of distribution and use, see the disclaimer
@@ -11,9 +11,9 @@ Libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.5.15beta05 - February 15, 2013
+ libpng versions 0.97, January 1998, through 1.5.15beta05 - February 17, 2013
  Updated and distributed by Glenn Randers-Pehrson
- Copyright (c) 1998-2012 Glenn Randers-Pehrson
+ Copyright (c) 1998-2013 Glenn Randers-Pehrson
 
  libpng 1.0 beta 6  version 0.96 May 28, 1997
  Updated and distributed by Andreas Dilger
@@ -4608,7 +4608,8 @@ left parenthesis that follows it:
        y[i] = a(x) + (int)b;
 
 We prefer #ifdef and #ifndef to #if defined() and #if !defined()
-when there is only one macro being tested.
+when there is only one macro being tested.  We always use parentheses
+with "defined".
 
 We prefer to express integers that are used as bit masks in hex format,
 with an even number of lower-case hex digits (e.g., 0x00, 0xff, 0x0100).
@@ -4621,7 +4622,7 @@ Other rules can be inferred by inspecting the libpng source.
 
 XIV. Y2K Compliance in libpng
 
-February 15, 2013
+February 17, 2013
 
 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 4ace07a85..e033bc825 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,4 +1,4 @@
-.TH LIBPNG 3 "February 15, 2013"
+.TH LIBPNG 3 "February 17, 2013"
 .SH NAME
 libpng \- Portable Network Graphics (PNG) Reference Library 1.5.15beta05
 .SH SYNOPSIS
@@ -492,10 +492,10 @@ 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 1.5.15beta05 - February 15, 2013
+ libpng version 1.5.15beta05 - February 17, 2013
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
- Copyright (c) 1998-2012 Glenn Randers-Pehrson
+ Copyright (c) 1998-2013 Glenn Randers-Pehrson
 
  This document is released under the libpng license.
  For conditions of distribution and use, see the disclaimer
@@ -503,9 +503,9 @@ Libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.5.15beta05 - February 15, 2013
+ libpng versions 0.97, January 1998, through 1.5.15beta05 - February 17, 2013
  Updated and distributed by Glenn Randers-Pehrson
- Copyright (c) 1998-2012 Glenn Randers-Pehrson
+ Copyright (c) 1998-2013 Glenn Randers-Pehrson
 
  libpng 1.0 beta 6  version 0.96 May 28, 1997
  Updated and distributed by Andreas Dilger
@@ -5101,7 +5101,8 @@ left parenthesis that follows it:
        y[i] = a(x) + (int)b;
 
 We prefer #ifdef and #ifndef to #if defined() and #if !defined()
-when there is only one macro being tested.
+when there is only one macro being tested.  We always use parentheses
+with "defined".
 
 We prefer to express integers that are used as bit masks in hex format,
 with an even number of lower-case hex digits (e.g., 0x00, 0xff, 0x0100).
@@ -5114,7 +5115,7 @@ Other rules can be inferred by inspecting the libpng source.
 
 .SH XIV. Y2K Compliance in libpng
 
-February 15, 2013
+February 17, 2013
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
@@ -5400,7 +5401,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.5.15beta05 - February 15, 2013:
+Libpng version 1.5.15beta05 - February 17, 2013:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -5423,7 +5424,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.5.15beta05, February 15, 2013, are
+libpng versions 1.2.6, August 15, 2004, through 1.5.15beta05, February 17, 2013, 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
@@ -5522,7 +5523,7 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-February 15, 2013
+February 17, 2013
 
 .\" end of man page
 
diff --git a/png.c b/png.c
index b8314fff8..00e7b7266 100644
--- a/png.c
+++ b/png.c
@@ -658,13 +658,13 @@ png_get_copyright(png_const_structp png_ptr)
 #else
 #  ifdef __STDC__
    return PNG_STRING_NEWLINE \
-     "libpng version 1.5.15beta05 - February 16, 2013" PNG_STRING_NEWLINE \
+     "libpng version 1.5.15beta05 - February 17, 2013" PNG_STRING_NEWLINE \
      "Copyright (c) 1998-2013 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
      "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
      "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
      PNG_STRING_NEWLINE;
 #  else
-      return "libpng version 1.5.15beta05 - February 16, 2013\
+      return "libpng version 1.5.15beta05 - February 17, 2013\
       Copyright (c) 1998-2013 Glenn Randers-Pehrson\
       Copyright (c) 1996-1997 Andreas Dilger\
       Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";