diff --git a/contrib/intel/INSTALL b/contrib/intel/INSTALL
new file mode 100644
index 000000000..abcfae8e6
--- /dev/null
+++ b/contrib/intel/INSTALL
@@ -0,0 +1,5 @@
+
+Copyright (c) 2016 Google, Inc.
+
+To enable SSE support, manually edit configure.ac and Makefile.am, following
+the instructions in the configure.ac.patch and Makefile.am.patch files. 
diff --git a/contrib/intel/filter_sse2_intrinsics.c b/contrib/intel/filter_sse2_intrinsics.c
index 4e060d9c8..b4ca61fa5 100644
--- a/contrib/intel/filter_sse2_intrinsics.c
+++ b/contrib/intel/filter_sse2_intrinsics.c
@@ -3,6 +3,8 @@
  *
  * Copyright (c) 2016 Google, Inc.
  *
+ * Last changed in libpng 1.6.22 [(PENDING RELEASE)]
+ *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
  * and license in png.h
diff --git a/contrib/intel/intel_init.c b/contrib/intel/intel_init.c
index 48fce2fd1..80fcfc2ec 100644
--- a/contrib/intel/intel_init.c
+++ b/contrib/intel/intel_init.c
@@ -3,6 +3,8 @@
  *
  * Copyright (c) 2016 Google, Inc.
  *
+ * Last changed in libpng 1.6.22 [(PENDING RELEASE)]
+ *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
  * and license in png.h