diff --git a/contrib/libtests/pngstest-errors.h b/contrib/libtests/pngstest-errors.h
index 931e994c8..75a5f37a6 100644
--- a/contrib/libtests/pngstest-errors.h
+++ b/contrib/libtests/pngstest-errors.h
@@ -2,6 +2,10 @@
  *
  * BUILT USING: libpng version 1.6.19beta03 - August 19, 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:
  *
diff --git a/contrib/libtests/pngstest.c b/contrib/libtests/pngstest.c
index 2e4f617c5..44267b4fb 100644
--- a/contrib/libtests/pngstest.c
+++ b/contrib/libtests/pngstest.c
@@ -3577,6 +3577,10 @@ main(int argc, char **argv)
       printf(" *\n");
       printf(" * BUILT USING:" PNG_HEADER_VERSION_STRING);
       printf(" *\n");
+      printf(" * This code is released under the libpng license.\n");
+      printf(" * For conditions of distribution and use, see the disclaimer\n");
+      printf(" * and license in png.h\n");
+      printf(" *\n");
       printf(" * THIS IS A MACHINE GENERATED FILE: do not edit it directly!\n");
       printf(" * Instead run:\n");
       printf(" *\n");