diff --git a/LICENSE b/LICENSE
index 9874cdf..064daaa 100644
--- a/LICENSE
+++ b/LICENSE
@@ -10,7 +10,7 @@
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.7.0beta58, March 17, 2015, are
+libpng versions 1.2.6, August 15, 2004, through 1.7.0beta58, March 23, 2015, are
 Copyright (c) 2004, 2006-2015 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
@@ -108,4 +108,4 @@
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-March 17, 2015
+March 23, 2015
diff --git a/README b/README
index df7c1a1..05935ef 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.7.0beta58 - March 17, 2015 (shared library 17.0)
+README for libpng version 1.7.0beta58 - March 23, 2015 (shared library 17.0)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.
diff --git a/libpng-manual.txt b/libpng-manual.txt
index 43dea59..5225207 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 1.7.0beta58 - March 22, 2015
+ libpng version 1.7.0beta58 - March 23, 2015
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2015 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.7.0beta58 - March 22, 2015
+ libpng versions 0.97, January 1998, through 1.7.0beta58 - March 23, 2015
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2015 Glenn Randers-Pehrson
 
@@ -5166,9 +5166,10 @@
 While these did not introduce API incompatibility, there may be differences
 in unit test results.
 
-Internal "affirm()" and "impossible()" macros were added. These are
-similar to the ANSI-C "assert()" macro but they are not affected by NDEBUG,
-and they are private and not visible to or usable by libpng applications.
+Internal "affirm()" and "impossible()" macros were added, along with
+some internal supporting macros and functions. These are similar to the
+ANSI-C "assert()" macro but they are not affected by NDEBUG, and they are
+private (not visible to nor usable by libpng applications).
 
 XIV.  Detecting libpng
 
@@ -5340,7 +5341,7 @@
 
 XVII. Y2K Compliance in libpng
 
-March 22, 2015
+March 23, 2015
 
 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 5e0313a..3308b73 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,4 +1,4 @@
-.TH LIBPNG 3 "March 22, 2015"
+.TH LIBPNG 3 "March 23, 2015"
 .SH NAME
 libpng \- Portable Network Graphics (PNG) Reference Library 1.7.0beta58
 .SH SYNOPSIS
@@ -494,7 +494,7 @@
 .SH LIBPNG.TXT
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.7.0beta58 - March 22, 2015
+ libpng version 1.7.0beta58 - March 23, 2015
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2015 Glenn Randers-Pehrson
@@ -505,7 +505,7 @@
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.7.0beta58 - March 22, 2015
+ libpng versions 0.97, January 1998, through 1.7.0beta58 - March 23, 2015
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2015 Glenn Randers-Pehrson
 
@@ -5660,9 +5660,10 @@
 While these did not introduce API incompatibility, there may be differences
 in unit test results.
 
-Internal "affirm()" and "impossible()" macros were added. These are
-similar to the ANSI-C "assert()" macro but they are not affected by NDEBUG,
-and they are private and not visible to or usable by libpng applications.
+Internal "affirm()" and "impossible()" macros were added, along with
+some internal supporting macros and functions. These are similar to the
+ANSI-C "assert()" macro but they are not affected by NDEBUG, and they are
+private (not visible to nor usable by libpng applications).
 
 .SH XIV.  Detecting libpng
 
@@ -5834,7 +5835,7 @@
 
 .SH XVII. Y2K Compliance in libpng
 
-March 22, 2015
+March 23, 2015
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
@@ -6151,7 +6152,7 @@
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.7.0beta58 - March 22, 2015:
+Libpng version 1.7.0beta58 - March 23, 2015:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -6174,7 +6175,7 @@
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.7.0beta58, March 22, 2015, are
+libpng versions 1.2.6, August 15, 2004, through 1.7.0beta58, March 23, 2015, are
 Copyright (c) 2004,2006-2015 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
@@ -6273,7 +6274,7 @@
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-March 22, 2015
+March 23, 2015
 
 .\" end of man page
 
diff --git a/libpngpf.3 b/libpngpf.3
index 89f1439..39fda29 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,4 +1,4 @@
-.TH LIBPNGPF 3 "March 17, 2015"
+.TH LIBPNGPF 3 "March 23, 2015"
 .SH NAME
 libpng \- Portable Network Graphics (PNG) Reference Library 1.7.0beta58
 (private functions)
diff --git a/png.5 b/png.5
index 9dc3ced..f4e2b50 100644
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "March 17, 2015"
+.TH PNG 5 "March 23, 2015"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
diff --git a/pngconf.h b/pngconf.h
index 2b67081..c33ec65 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.7.0beta58, March 17, 2015
+ * libpng version 1.7.0beta58, March 23, 2015
  *
  * Copyright (c) 1998-2015 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/projects/vstudio/readme.txt b/projects/vstudio/readme.txt
index 309fd3b..9e1a9bb 100644
--- a/projects/vstudio/readme.txt
+++ b/projects/vstudio/readme.txt
@@ -1,7 +1,7 @@
 
 VisualStudio instructions
 
-libpng version 1.7.0beta58 - March 17, 2015
+libpng version 1.7.0beta58 - March 23, 2015
 
 Copyright (c) 1998-2010 Glenn Randers-Pehrson
 
diff --git a/projects/vstudio/zlib.props b/projects/vstudio/zlib.props
index 2524c68..1619b91 100644
--- a/projects/vstudio/zlib.props
+++ b/projects/vstudio/zlib.props
@@ -2,7 +2,7 @@
 <!--
  * zlib.props - location of zlib source
  *
- * libpng version 1.7.0beta58 - March 17, 2015
+ * libpng version 1.7.0beta58 - March 23, 2015
  *
  * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  *
diff --git a/scripts/README.txt b/scripts/README.txt
index 46375f4..28d8332 100644
--- a/scripts/README.txt
+++ b/scripts/README.txt
@@ -1,5 +1,5 @@
 
-Makefiles for  libpng version 1.7.0beta58 - March 17, 2015
+Makefiles for  libpng version 1.7.0beta58 - March 23, 2015
 
 pnglibconf.h.prebuilt       =>  Stores configuration settings
  makefile.linux    =>  Linux/ELF makefile
diff --git a/scripts/pnglibconf.h.prebuilt b/scripts/pnglibconf.h.prebuilt
index 3958b38..676c5f0 100644
--- a/scripts/pnglibconf.h.prebuilt
+++ b/scripts/pnglibconf.h.prebuilt
@@ -2,7 +2,7 @@
 
 /* pnglibconf.h - library build configuration */
 
-/* Libpng version 1.7.0beta58 - March 17, 2015 */
+/* Libpng version 1.7.0beta58 - March 23, 2015 */
 
 /* Copyright (c) 1998-2014 Glenn Randers-Pehrson */