diff --git a/storage/storage.go b/storage/storage.go
index cd229ec..41f1483 100644
--- a/storage/storage.go
+++ b/storage/storage.go
@@ -16,5 +16,5 @@ type Storage interface {
 	Url(objectName string, expire time.Duration) string
 	Stat(objectName string) (*ObjectInfo, error)
 	List(objectPrefix string) ([]string, error)
-	Fetch(url, objectName string, local ...bool) error
+	Fetch(url, objectName string, local ...bool) error //local参数决定是否先下载到本地在上传，七牛云下载企业微信的文件需要不能直接下载
 }