diff --git a/packages/frontend/src/scripts/clone.ts b/packages/frontend/src/scripts/clone.ts
index 16fad2412..cf8fa64ba 100644
--- a/packages/frontend/src/scripts/clone.ts
+++ b/packages/frontend/src/scripts/clone.ts
@@ -1,5 +1,7 @@
 // structredCloneが遅いため
 // SEE: http://var.blog.jp/archives/86038606.html
+// あと、Vue RefをIndexedDBに保存しようとしてstructredCloneを使ったらエラーになった
+// https://github.com/misskey-dev/misskey/pull/8098#issuecomment-1114144045
 
 type Cloneable = string | number | boolean | null | { [key: string]: Cloneable } | Cloneable[];