Added introduction, architecture section
Updated license header on new files.
Change-Id: Ic44db303ab935099698f8c6547904802381fce5c
diff --git a/glossary.rst b/glossary.rst
index 0c7823b..b0c598a 100644
--- a/glossary.rst
+++ b/glossary.rst
@@ -1,3 +1,8 @@
+..
+ SPDX-FileCopyrightText: © 2020 Open Networking Foundation <support@opennetworking.org>
+ SPDX-License-Identifier: Apache-2.0
+
+
Glossary
========
@@ -5,11 +10,11 @@
---------
- NGAP: NG Application Protocol used over N2 interface
- S1AP: S1 Application Protocol used over S1-AP interface
-- Diameter: S6a
+- Diameter: S6a, Gx interface
- NAS: Non-Access-Stratum used between UE & MME/AMF.
- PFCP: Packet Forwarding Control Protocol
-- GTPv1
-- GTPv2
+- GTPU: GTP user plane protocol. Used on s1-U, s5-U, N3, N9 interfaces
+- GTPv2: GTP control plane protocol used on s11 interface between MME & SGW
Network Functions
-----------------