Fix copyrights
diff --git a/test/cpp/interop/client_helper.cc b/test/cpp/interop/client_helper.cc
index c8b1e50..029b967 100644
--- a/test/cpp/interop/client_helper.cc
+++ b/test/cpp/interop/client_helper.cc
@@ -1,6 +1,6 @@
/*
*
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
diff --git a/test/cpp/interop/interop_test.cc b/test/cpp/interop/interop_test.cc
index 019d6ae..f0fccf4 100644
--- a/test/cpp/interop/interop_test.cc
+++ b/test/cpp/interop/interop_test.cc
@@ -1,6 +1,6 @@
/*
*
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
diff --git a/test/cpp/interop/server_helper.h b/test/cpp/interop/server_helper.h
index 12865e4..38c2fba 100644
--- a/test/cpp/interop/server_helper.h
+++ b/test/cpp/interop/server_helper.h
@@ -1,6 +1,6 @@
/*
*
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without