diff --git a/ANNOUNCE b/ANNOUNCE
index b4e44d9..0fdaeb6 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.4.0beta50 - March 9, 2009
+Libpng 1.4.0beta51 - March 21, 2009
 
 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.
@@ -9,27 +9,27 @@
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.4.0beta50.tar.gz
-   1.4.0beta50.tar.bz2
+   1.4.0beta51.tar.gz
+   1.4.0beta51.tar.bz2
 
 Source files with LF line endings (for Unix/Linux) without the
 "configure" script
 
-   1.4.0beta50-no-config.tar.gz
-   1.4.0beta50-no-config.tar.bz2
+   1.4.0beta51-no-config.tar.gz
+   1.4.0beta51-no-config.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp140b50.zip
-   lp140b50.tar.bz2
+   lp140b51.zip
+   lp140b51.tar.bz2
 
 Other information:
 
-   1.4.0beta50-README.txt
-   1.4.0beta50-KNOWNBUGS.txt
-   1.4.0beta50-LICENSE.txt
-   1.4.0beta50-Y2K-compliance.txt
+   1.4.0beta51-README.txt
+   1.4.0beta51-KNOWNBUGS.txt
+   1.4.0beta51-LICENSE.txt
+   1.4.0beta51-Y2K-compliance.txt
 
 Changes since the last public release (1.2.10):
 
@@ -343,7 +343,7 @@
   Added check for zero-area RGB cHRM triange in png_check_cHRM() and
     png_check_cHRM_fixed().
 
-version 1.4.0beta39 [March 9, 2009]
+version 1.4.0beta39 [March 21, 2009]
   Revised png_warning() to write its message on standard output by default
     when warning_fn is NULL.
 
@@ -392,9 +392,19 @@
     (bug introduced in libpng-1.2.34/1.4.0beta29).
   Revised comments in png_set_read_fn() and png_set_write_fn().
 
-version 1.4.0beta50 [March 9, 2009]
+version 1.4.0beta50 [March 21, 2009]
   Use png_calloc() instead of png_malloc() to allocate big_row_buf when
     reading an interlaced file, to avoid a possible UMR.
+  Undid recent revision of PNG_NO_STDIO version of png_write_flush().  Users
+    having trouble with fflush() can build with PNG_NO_WRITE_FLUSH defined
+    or supply their own flush_fn() replacement.
+  Revised libpng*.txt and png.h documentation about use of png_write_flush()
+    and png_set_write_fn().
+  Removed fflush() from pngtest.c.
+  Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h
+
+version 1.4.0beta51 [March 21, 2009]
+  Removed new png_fileno() macro from pngconf.h .
 
 version 1.4.0betaN [future]
   Build shared libraries with -lz and sometimes -lm.