diff --git a/xos/synchronizer/models/fabric.xproto b/xos/synchronizer/models/fabric.xproto
index ac617be..71ad3ee 100644
--- a/xos/synchronizer/models/fabric.xproto
+++ b/xos/synchronizer/models/fabric.xproto
@@ -24,6 +24,7 @@
 
     required manytoone switch->Switch:ports = 1 [help_text = "The fabric switch the port belongs to", db_index = True, null = False, blank = False, tosca_key=True];
     required int32 portId = 2 [help_text = "The unique port OpenFlow port ID", null = False, db_index = False, blank = False, tosca_key=True];
+    required bool host_learning = 3 [help_text = "whether or not to enable autodiscovery", default = True, null = False, db_index = False, blank = False];
 }
 
 message PortInterface(XOSBase) {