diff --git a/pkg/serializer/explorer.go b/pkg/serializer/explorer.go
index c3f697c..6a76d6c 100644
--- a/pkg/serializer/explorer.go
+++ b/pkg/serializer/explorer.go
@@ -19,5 +19,5 @@ type ObjectProps struct {
 	ChildFileNum   int       `json:"child_file_num"`
 	Path           string    `json:"path"`
 
-	QueryDate time.Time
+	QueryDate time.Time `json:"query_date"`
 }