Update QoS documentation
Change-Id: I2d928e8f9a1fd824a8781e6506ccb0276bb91833
diff --git a/advanced/p4-upf.rst b/advanced/p4-upf.rst
index 77ce957..325323b 100644
--- a/advanced/p4-upf.rst
+++ b/advanced/p4-upf.rst
@@ -40,9 +40,9 @@
servers. Then, when the device radio becomes ready to receive traffic,
packets are drained from the software buffers back to the switch to be
delivered to base stations.
-* QoS: support for enforcement of maximum bitrate (MBR), minimum guaranteed
- bitrate (GBR, via admission control), and prioritization using switch
- queues and scheduling policy.
+* QoS: support for enforcement of maximum bitrate (MBR) at the application,
+ session, and slice level; and prioritization using switch queues and
+ scheduling policy.
* Slicing: multiple logical UPFs can be instantiated on the same switch, each
one with its own QoS model and isolation guarantees enforced at the hardware
level using separate queues.