diff --git a/code/API_definitions/geofencing-subscriptions.yaml b/code/API_definitions/geofencing-subscriptions.yaml
index 5a0262a..3374b53 100644
--- a/code/API_definitions/geofencing-subscriptions.yaml
+++ b/code/API_definitions/geofencing-subscriptions.yaml
@@ -780,6 +780,7 @@ components:
         - specversion
         - type
         - time
+        - data
       properties:
         id:
           type: string