diff --git a/protos/voltha_protos/device.proto b/protos/voltha_protos/device.proto
index f4c44f5..1341dac 100644
--- a/protos/voltha_protos/device.proto
+++ b/protos/voltha_protos/device.proto
@@ -210,6 +210,10 @@
     fixed64 tx_bytes = 13;
     fixed64 tx_errors = 14;
 
+    // ofp_port represents the characteristics of a port, e.g. hardware
+    // address and supported features.  This field is relevant only for
+    // UNI and NNI ports.   For PON ports, it can be left empty.
+    openflow_13.ofp_port ofp_port = 15;
 }
 
 message Ports {