diff --git a/sdk_container/src/third_party/portage-stable/README b/sdk_container/src/third_party/portage-stable/README
new file mode 100644
index 0000000000..4ca56099eb
--- /dev/null
+++ b/sdk_container/src/third_party/portage-stable/README
@@ -0,0 +1,6 @@
+Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+
+This overlay contains Portage packages that are part of the Chromium OS build
+and are exact copies of upstream Portage packages.