Minor fixes
Change-Id: Idd71bb79096984441b7ba648897701eb564e1e72
diff --git a/advanced/upf.rst b/advanced/upf.rst
index e1cc182..94cac1f 100644
--- a/advanced/upf.rst
+++ b/advanced/upf.rst
@@ -71,8 +71,8 @@
SD-Fabric's P4-UPF is integrated with the ONF SD-Core project to provide a
high-performance 3GPP-compliant mobile core solution.
-The integration with SD-Core is achieved via an ONOS called UP4, which is in
-charge of populating the UPF tables of the switch pipeline.
+The integration with SD-Core is achieved via an ONOS application called UP4,
+which is in charge of populating the UPF tables of the switch pipeline.
.. image:: ../images/up4-arch.png
:width: 600px