diff --git a/ANNOUNCE b/ANNOUNCE
index 66c3954f1..be4a2a5dd 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,4 +1,4 @@
-Libpng 1.6.22beta01 - January 17, 2016
+Libpng 1.6.22beta01 - January 18, 2016
 
 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.
@@ -25,9 +25,11 @@ Other information:
 
 Changes since the last public release (1.6.21):
 
-Version 1.6.22beta01 [January 17, 2016]
+Version 1.6.22beta01 [January 18, 2016]
   Changed PNG_USE_MKSTEMP to __COVERITY__ to select alternate
     "tmpfile()" implementation in contrib/libtests/pngstest.c
+  Fixed NO_STDIO build of pngunknown.c to skip calling png_init_io()
+    if there is no stdio.h support.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index c034e11b2..fb85129fb 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5484,9 +5484,11 @@ Version 1.6.21rc02 [January 7, 2016]
 Version 1.6.21 [January 15, 2016]
   Worked around a false-positive Coverity issue in pngvalid.c.
 
-Version 1.6.22beta01 [January 17, 2016]
+Version 1.6.22beta01 [January 18, 2016]
   Changed PNG_USE_MKSTEMP to __COVERITY__ to select alternate
     "tmpfile()" implementation in contrib/libtests/pngstest.c
+  Fixed NO_STDIO build of pngunknown.c to skip calling png_init_io()
+    if there is no stdio.h support.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/contrib/libtests/pngunknown.c b/contrib/libtests/pngunknown.c
index 3f9977e9e..8bbc5d4ad 100644
--- a/contrib/libtests/pngunknown.c
+++ b/contrib/libtests/pngunknown.c
@@ -1,8 +1,8 @@
 
 /* pngunknown.c - test the read side unknown chunk handling
  *
- * Last changed in libpng 1.6.10 [March 6, 2014]
- * Copyright (c) 2014 Glenn Randers-Pehrson
+ * Last changed in libpng 1.6.22 [(PENDING RELEASE)]
+ * Copyright (c) 2016 Glenn Randers-Pehrson
  * Written by John Cunningham Bowler
  *
  * This code is released under the libpng license.