diff --git a/common/response.go b/common/response.go
index e5e4488..f96e5be 100644
--- a/common/response.go
+++ b/common/response.go
@@ -1,7 +1,8 @@
 package common
 
+// Response is the data that is always returned with an API request.
 type Response struct {
-	Code int `json:"code"`
-	Message string `json:"message"`
-	Data interface{} `json:"data"`
+	Code    int         `json:"code"`
+	Message string      `json:"message,omitempty"`
+	Data    interface{} `json:"data"`
 }