diff --git a/internal/bill/domain.go b/internal/bill/domain.go
index 9dbc858..4927860 100644
--- a/internal/bill/domain.go
+++ b/internal/bill/domain.go
@@ -13,6 +13,7 @@ type Bill struct {
 	Options string  `json:"options"`
 }
 
+// BDate 用于判断获取bill的时间范围
 type BDate struct {
 	Year  int `json:"year"`
 	Month int `json:"month"`