diff --git a/events/oss.go b/events/oss.go
index ed7d60f..60f3bdb 100644
--- a/events/oss.go
+++ b/events/oss.go
@@ -42,6 +42,7 @@ type Object struct {
 
 type ObjectMeta struct {
 	MimeType *string `json:"mimeType"`
+	UserMeta map[string]string `json:"userMeta"`
 }
 
 type RequestParameters struct {