diff --git a/ANNOUNCE b/ANNOUNCE
index 9c36f91b5..00c531d63 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.6.13beta01 - June 13, 2014
+Libpng 1.6.13beta01 - June 22, 2014
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -26,12 +26,14 @@ Other information:
 
 Changes since the last public release (1.6.13):
 
-Version 1.6.13beta01 [June 13, 2014]
+Version 1.6.13beta01 [June 22, 2014]
   Quieted -Wsign-compare and -Wclobber compiler warnings in
     contrib/pngminus/*.c
   Added "(void) png_ptr;" where needed in contrib/gregbook to quiet
     compiler complaints about unused pointers.
   Split a long output string in contrib/gregbook/rpng2-x.c.
+  Added "PNG_SET_OPTION" requirement for sRGB chunk support to pnglibconf.dfa,
+    Needed for write-only support (John Bowler).
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index a73ee4673..56de08399 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4940,13 +4940,15 @@ Version 1.6.12rc03 [June 8, 2014]
 Version 1.6.12 [June 12, 2014]
   No changes.
 
-Version 1.6.13beta01 [June 13, 2014]
+Version 1.6.13beta01 [June 22, 2014]
   Quieted -Wsign-compare and -Wclobber compiler warnings in
     contrib/pngminus/*.c
   Added "(void) png_ptr;" where needed in contrib/gregbook to quiet
     compiler complaints about unused pointers.
   Split a long output string in contrib/gregbook/rpng2-x.c.
-
+  Added "PNG_SET_OPTION" requirement for sRGB chunk support to pnglibconf.dfa,
+    Needed for write-only support (John Bowler).
+    
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
diff --git a/scripts/pnglibconf.dfa b/scripts/pnglibconf.dfa
index 294a4e22e..46f61c2e7 100644
--- a/scripts/pnglibconf.dfa
+++ b/scripts/pnglibconf.dfa
@@ -721,7 +721,7 @@ chunk pHYs
 chunk sBIT
 chunk sCAL
 chunk sPLT
-chunk sRGB enables COLORSPACE, GAMMA
+chunk sRGB enables COLORSPACE, GAMMA, SET_OPTION
 chunk tEXt requires TEXT
 chunk tIME
 chunk tRNS