diff --git a/docs/oss/attribution.md b/docs/oss/attribution.md
index 1b8ca5a..9de148d 100644
--- a/docs/oss/attribution.md
+++ b/docs/oss/attribution.md
@@ -192,6 +192,8 @@ Copyright (c) 2006-2011 Kirill Simonov
 
 Copyright (c) 2011-2019 Canonical Ltd
 
+Copyright 2011-2016 Canonical Ltd.
+
 SPDX-License-Identifier: Apache-2.0 AND MIT
 
 License and notices: [Apache 2.0](licenses/Apache-2.0.txt) |