diff --git a/api/services/notificationCenter/schemas/subscription.yaml b/api/services/notificationCenter/schemas/subscription.yaml
index 272a1608..ab924cec 100644
--- a/api/services/notificationCenter/schemas/subscription.yaml
+++ b/api/services/notificationCenter/schemas/subscription.yaml
@@ -8,5 +8,6 @@ items:
       enum: ["email", "webhook", "slack", "sns"]
       example: "email"
     endpoint:
+      description: "Target endpoint [max limit 500 characters]"
       type: string
       example: "endpoint@example.com"