diff --git a/rw_core/config/config.go b/rw_core/config/config.go
index f977be0..f87d8ce 100644
--- a/rw_core/config/config.go
+++ b/rw_core/config/config.go
@@ -124,6 +124,9 @@
 
 	var help string
 
+	help = fmt.Sprintf("RW instance id")
+	flag.StringVar(&(cf.InstanceID), "instance-id", default_InstanceID, help)
+
 	help = fmt.Sprintf("RW core endpoint address")
 	flag.StringVar(&(cf.RWCoreEndpoint), "vcore-endpoint", default_RWCoreEndpoint, help)