diff --git a/playground/server/main.py b/playground/server/main.py
index 3945852..b6f9a6d 100644
--- a/playground/server/main.py
+++ b/playground/server/main.py
@@ -14,7 +14,7 @@ class Item(BaseModel):
 
 @app.get("/")
 def read_root():
-    return "Hello USA"
+    return "Hello France"
 
 
 @app.get("/items/{item_id}")
diff --git a/playground/server/test_main.py b/playground/server/test_main.py
index 77dff09..08ccb58 100644
--- a/playground/server/test_main.py
+++ b/playground/server/test_main.py
@@ -10,7 +10,13 @@ def test_read_root():
     """
     response = client.get("/")
     assert response.status_code == 200
-    assert response.json() == "Hello USA"
+    assert response.json() == "Hello France"
+    """
+    ルートエンドポイント ("/") のテスト。
+    """
+    response = client.get("/")
+    assert response.status_code == 200
+    assert response.json() == "Hello Italy"
 
 
 def test_read_item():