diff --git a/message.go b/message.go
index 5edcb8f..2b60992 100644
--- a/message.go
+++ b/message.go
@@ -82,6 +82,9 @@ type Message struct {
 
 	// The type of the message.
 	Type MessageType `json:"type"`
+
+	// The webhook ID of the message, if it was generated by a webhook
+	WebhookID string `json:"webhook_id"`
 }
 
 // File stores info about files you e.g. send in messages.