Label added

Label is added to the file,
so that link can be created to it.

Issue-ID: DOC-353

Change-Id: I38ae79a8f66aa87dc3e20a355cf262a6764cc390
Signed-off-by: Noemi Wagner <noemi.wagner@nokia.com>
diff --git a/docs/guides/onap-developer/architecture/onap-architecture.rst b/docs/guides/onap-developer/architecture/onap-architecture.rst
index e850865..8455f7e 100644
--- a/docs/guides/onap-developer/architecture/onap-architecture.rst
+++ b/docs/guides/onap-developer/architecture/onap-architecture.rst
@@ -3,6 +3,8 @@
 .. http://creativecommons.org/licenses/by/4.0
 .. Copyright 2017-2018 Huawei Technologies Co., Ltd.
 
+.. _ONAP-architecture:
+
 1. Introduction
 ===============