From 03e040ae48e5198def42326ac67c3568287b93f6 Mon Sep 17 00:00:00 2001
From: WATAHIKI Yuto <chvmvd@gmail.com>
Date: Sat, 28 Mar 2026 19:18:30 +0900
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---
 docs/1-trial-session/09-functions/index.mdx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/1-trial-session/09-functions/index.mdx b/docs/1-trial-session/09-functions/index.mdx
index cebaefb5..b4c0f7fb 100644
--- a/docs/1-trial-session/09-functions/index.mdx
+++ b/docs/1-trial-session/09-functions/index.mdx
@@ -51,7 +51,7 @@ greet("morning", "佐藤");
 {/* prettier-ignore */}
 <Term>関数</Term>呼び出しは<Term>式</Term>の一種です。<Term>関数</Term>定義内で**return文**を用いると、<Term>関数</Term>の実行が停止され、<Term>関数</Term>呼び出し<Term>式</Term>の<Term>評価</Term>結果が確定します。この値を<Term>**戻り値**</Term>と呼びます。ある<Term>値</Term>を<Term>戻り値</Term>として設定して<Term>関数</Term>の実行を終了することを、<Term>関数</Term>がその<Term>値</Term>を<Term>**返す**</Term>と表現します。
 
-```javascript
+```javascript showLineNumbers
 function add(a, b) {
   const sum = a + b;
   return sum;