diff --git a/docs/1-trial-session/11-object/_samples/incrementAge/script.js b/docs/1-trial-session/11-object/_samples/incrementAge/script.js
index e2bb135fe..5df8084bd 100644
--- a/docs/1-trial-session/11-object/_samples/incrementAge/script.js
+++ b/docs/1-trial-session/11-object/_samples/incrementAge/script.js
@@ -4,5 +4,9 @@ function incrementAge(person) {
 }
 
 const tanaka = { name: "田中", age: 18 };
+const sato = { name: "佐藤", age: 22 };
 const nextYearTanaka = incrementAge(tanaka);
-document.write(nextYearTanaka.age);
+const nextYearSato = incrementAge(sato);
+document.write(
+  `田中は ${nextYearTanaka.age} 歳、佐藤は ${nextYearSato.age} 歳`,
+);
diff --git a/docs/1-trial-session/11-object/index.mdx b/docs/1-trial-session/11-object/index.mdx
index 65045b62a..4d9117cae 100644
--- a/docs/1-trial-session/11-object/index.mdx
+++ b/docs/1-trial-session/11-object/index.mdx
@@ -143,8 +143,13 @@ function incrementAge(person) {
 }
 
 const tanaka = { name: "田中", age: 18 };
+const sato = { name: "佐藤", age: 22 };
 const nextYearTanaka = incrementAge(tanaka);
-document.write(nextYearTanaka.age); // 19 と表示されてほしい
+const nextYearSato = incrementAge(sato);
+// 19 歳、23 歳 と表示されてほしい
+document.write(
+  `田中は ${nextYearTanaka.age} 歳、佐藤は ${nextYearSato.age} 歳`,
+);
 ```
 
 <Answer title="年齢を増やす">
@@ -156,8 +161,12 @@ function incrementAge(person) {
 }
 
 const tanaka = { name: "田中", age: 18 };
+const sato = { name: "佐藤", age: 22 };
 const nextYearTanaka = incrementAge(tanaka);
-document.write(nextYearTanaka.age);
+const nextYearSato = incrementAge(sato);
+document.write(
+  `田中は ${nextYearTanaka.age} 歳、佐藤は ${nextYearSato.age} 歳`,
+);
 ```
 
 <ViewSource url={import.meta.url} path="_samples/incrementAge" />