diff --git a/authentik/events/api/notification_transport.py b/authentik/events/api/notification_transport.py
index b36b2dd71..b20d0bd97 100644
--- a/authentik/events/api/notification_transport.py
+++ b/authentik/events/api/notification_transport.py
@@ -36,6 +36,7 @@ class NotificationTransportSerializer(ModelSerializer):
             "mode",
             "mode_verbose",
             "webhook_url",
+            "send_once",
         ]
 
 
diff --git a/swagger.yaml b/swagger.yaml
index 19efba957..e423dee30 100755
--- a/swagger.yaml
+++ b/swagger.yaml
@@ -15203,6 +15203,11 @@ definitions:
       webhook_url:
         title: Webhook url
         type: string
+      send_once:
+        title: Send once
+        description: Only send notification once, for example when sending a webhook
+          into a chat channel.
+        type: boolean
   NotificationTransportTest:
     description: Notification test serializer
     required: