--- /dev/null
+This work includes YANG models developed by the OpenConfig working group
+and originally published under the Apache License Version 2.
+A copy of the original license can be found in the file openconfig.LICENSE
+
+More details at the http://www.openconfig.net/ web site.
+
+OpenConfig models license is usually not mentioned in their YANG description
+field. Exceptions include models derived from the IETF works and originally
+published under the IETF license.