diff --git a/apps/openstacknode/api/src/main/java/org/onosproject/openstacknode/api/Constants.java b/apps/openstacknode/api/src/main/java/org/onosproject/openstacknode/api/Constants.java
index 8bf4ceb..c10820e 100644
--- a/apps/openstacknode/api/src/main/java/org/onosproject/openstacknode/api/Constants.java
+++ b/apps/openstacknode/api/src/main/java/org/onosproject/openstacknode/api/Constants.java
@@ -29,6 +29,7 @@
     public static final String PATCH_INTG_BRIDGE = "patch-intg";
     public static final String PATCH_ROUT_BRIDGE = "patch-rout";
     public static final String GATEWAY = "GATEWAY";
+    public static final String CONTROLLER = "CONTROLLER";
     public static final String HOST_NAME = "hostname";
     public static final String TYPE = "type";
     public static final String MANAGEMENT_IP = "managementIp";