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