diff --git a/pkg/errors/errors.go b/pkg/errors/errors.go
index ca9e8c3..c911c67 100644
--- a/pkg/errors/errors.go
+++ b/pkg/errors/errors.go
@@ -13,6 +13,7 @@ import (
 // Scope 全域變數應由服務或模組設置
 var Scope = code.Unset
 
+// Err 6 碼，服務 2, 大類 2, 詳細錯誤 2
 type Err struct {
 	category    uint32
 	code        uint32