diff --git a/ANNOUNCE b/ANNOUNCE
index 33856107..671b6b7b 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.2.37 - May 31, 2009
+Libpng 1.2.37 - June 2, 2009
 
 This is a public release of libpng, intended for use in production codes.
 
@@ -42,7 +42,7 @@ Other information:
 
 Changes since the last public release (1.2.36):
 
-version 1.2.37 [May 31, 2009]
+version 1.2.37 [June 2, 2009]
 
   Fixed inconsistency in pngrutil.c, introduced in libpng-1.2.36.  The
     memset() was using "png_ptr->rowbytes" instead of "row_bytes", which
@@ -59,6 +59,10 @@ version 1.2.37 [May 31, 2009]
     is only one makefile in those directories, and revised the README files
     accordingly.
   Reformated sources in libpng style (3-space indentation, comment format)
+  Added sections about the git repository and our coding style to the
+    documentation (merged from libpng-1.4.0beta62)
+  Added a section about using png_get_io_ptr() in configure scripts to detect
+    the presence of libpng.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit 
diff --git a/CHANGES b/CHANGES
index 1a19f2b4..a8c53fb1 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2400,6 +2400,8 @@ version 1.2.37 [June 2, 2009]
     and "define PNG_NO_READ_SWAP" to decoder/pngusr.h and preader/pngusr.h
   Added sections about the git repository and our coding style to the
     documentation (merged from libpng-1.4.0beta62)
+  Added a section about using png_get_io_ptr() in configure scripts to detect
+    the presence of libpng.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/libpng-1.2.37.txt b/libpng-1.2.37.txt
index ff6f0a86..1f0c78a7 100644
--- a/libpng-1.2.37.txt
+++ b/libpng-1.2.37.txt
@@ -2946,7 +2946,14 @@ when the Intel assembler code was removed due to a licensing issue.
 
 IX.  (Omitted)
 
-X. Source code repository
+X. Detecting libpng
+
+The png_get_io_ptr() function has been present since libpng-0.88, has never
+changed, and is unaffected by conditional compilation macros.  It is the
+best choice for use in configure scripts for detecting the presence of any
+libpng version since 0.88.
+
+XI. Source code repository
 
 Since about February 2009, version 1.2.34, libpng has been under "git" source
 control.  The git repository was built from old libpng-x.y.z.tar.gz files
@@ -2965,7 +2972,7 @@ the libpng bug tracker at
 
     http://libpng.sourceforge.net
 
-XI. Coding style
+XII. Coding style
 
 Our coding style is similar to the "Allman" style, with curly
 braces on separate lines:
@@ -3051,7 +3058,7 @@ left parenthesis that follows it:
 Other rules can be inferred by inspecting the libpng
 source.
 
-XII. Y2K Compliance in libpng
+XIII. Y2K Compliance in libpng
 
 June 2, 2009