diff --git a/ANNOUNCE b/ANNOUNCE
index 9126b3c65..a473b0316 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -933,6 +933,11 @@ Version 1.7.0beta66 [September 25, 2015]
     that optimizes RGB to Gray transformations that only selected on
     channel and clarifies the handling of max_depth in the transform
     code.
+  Incorporated new test PNG files into make check.  tests/pngstest-*
+    are changed so that the new test files are divided into 8 groups by
+    gamma and alpha channel.  These tests have considerably better code
+    and pixel-value coverage than contrib/pngsuite; however,coverage is
+    still incomplete.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index 6753ed885..81e112930 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5232,6 +5232,11 @@ Version 1.7.0beta66 [September 25, 2015]
     that optimizes RGB to Gray transformations that only selected on
     channel and clarifies the handling of max_depth in the transform
     code.
+  Incorporated new test PNG files into make check.  tests/pngstest-*
+    are changed so that the new test files are divided into 8 groups by
+    gamma and alpha channel.  These tests have considerably better code
+    and pixel-value coverage than contrib/pngsuite; however,coverage is
+    still incomplete.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/contrib/README.txt b/contrib/README.txt
index bcd433d35..97963c6d5 100644
--- a/contrib/README.txt
+++ b/contrib/README.txt
@@ -1,4 +1,5 @@
 
 This "contrib" directory contains contributions which are not necessarily under
 the libpng license, although all are open source.  They are not part of
-libpng proper and are not used for building the library.
+libpng proper and are not used for building the library, although some are used
+for testing the library via "make check".
diff --git a/contrib/libtests/pngstest-errors.h b/contrib/libtests/pngstest-errors.h
index 4ebc25030..032f0f6f2 100644
--- a/contrib/libtests/pngstest-errors.h
+++ b/contrib/libtests/pngstest-errors.h
@@ -2,6 +2,10 @@
  *
  * BUILT USING: libpng version 1.7.0beta66 - September 18, 2015
  *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
  * THIS IS A MACHINE GENERATED FILE: do not edit it directly!
  * Instead run:
  *