diff --git a/notification/src/main/java/org/killbill/billing/notification/plugin/api/ExtBusEventType.java b/notification/src/main/java/org/killbill/billing/notification/plugin/api/ExtBusEventType.java
index db5186d..4aeac08 100644
--- a/notification/src/main/java/org/killbill/billing/notification/plugin/api/ExtBusEventType.java
+++ b/notification/src/main/java/org/killbill/billing/notification/plugin/api/ExtBusEventType.java
@@ -28,6 +28,7 @@ public enum ExtBusEventType {
     SUBSCRIPTION_CREATION,
     SUBSCRIPTION_PHASE,
     SUBSCRIPTION_CHANGE,
+    SUBSCRIPTION_UNDO_CHANGE,
     SUBSCRIPTION_CANCEL,
     SUBSCRIPTION_UNCANCEL,
     SUBSCRIPTION_BCD_CHANGE,