diff --git a/source/_posts/2021/split-bill.md b/source/_posts/2021/split-bill.md
index 38e1d61..433e81a 100644
--- a/source/_posts/2021/split-bill.md
+++ b/source/_posts/2021/split-bill.md
@@ -19,7 +19,7 @@ date: 2021-02-14T00:00:00
 
 実際にコードを書いて本当に望んでいる結果が得られるのかを検証します。
 
-```5js
+```js
 const history = [
   {
     amount: 121,