diff --git a/pkg/api/flamenco-manager.yaml b/pkg/api/flamenco-manager.yaml
index 6d1a619e..433db898 100644
--- a/pkg/api/flamenco-manager.yaml
+++ b/pkg/api/flamenco-manager.yaml
@@ -1262,7 +1262,8 @@ components:
           description: Timestamp of last update
         "status": { $ref: "#/components/schemas/TaskStatus" }
         "previous_status": { $ref: "#/components/schemas/TaskStatus" }
-      required: [id, job_id, name, updated, status]
+        "activity": { type: string }
+      required: [id, job_id, name, updated, status, activity]
 
     SocketIOSubscription:
       type: object