diff --git a/platformapi/dadaapi/callback.go b/platformapi/dadaapi/callback.go
index e01a6f48..0c6d2688 100644
--- a/platformapi/dadaapi/callback.go
+++ b/platformapi/dadaapi/callback.go
@@ -31,7 +31,7 @@ type CallbackMsg struct {
 }
 
 type CallbackResponse struct {
-	Code  int
+	Code  int    `json:"code"` // 对于达达是无意义的，只是用于传递相应的HTTP CODE
 	Dummy string `json:"dummy"`
 }