diff --git a/docs/05-variables/_samples/counter/script.js b/docs/05-variables/_samples/counter/script.js
index c533be0..441b73c 100644
--- a/docs/05-variables/_samples/counter/script.js
+++ b/docs/05-variables/_samples/counter/script.js
@@ -1,4 +1,4 @@
 let counter = 0;
-document.write(counter);
+document.write("カウンターの値は、" + counter + "です。");
 counter = counter + 1;
-document.write(counter);
+document.write("カウンターの値は、" + counter + "です。");
diff --git a/docs/05-variables/index.mdx b/docs/05-variables/index.mdx
index 436168a..2ede734 100644
--- a/docs/05-variables/index.mdx
+++ b/docs/05-variables/index.mdx
@@ -73,9 +73,9 @@ JavaScript では変数の名前は、複数の単語にわたるフレーズを
 
 ```javascript
 let counter = 0;
-document.write(counter);
+document.write("カウンターの値は、" + counter + "です。");
 counter = counter + 1;
-document.write(counter);
+document.write("カウンターの値は、" + counter + "です。");
 ```
 
 <ViewSource url={import.meta.url} path="_samples/counter" />