diff --git a/docs_src/advanced_middleware/tutorial002.py b/docs_src/advanced_middleware/tutorial002.py
index 302b5e81a..0b2ca7394 100644
--- a/docs_src/advanced_middleware/tutorial002.py
+++ b/docs_src/advanced_middleware/tutorial002.py
@@ -4,7 +4,9 @@ from fastapi.middleware.trustedhost import TrustedHostMiddleware
 app = FastAPI()
 
 app.add_middleware(
-    TrustedHostMiddleware, allowed_hosts=["example.com", "*.example.com"], www_redirect=True
+    TrustedHostMiddleware,
+    allowed_hosts=["example.com", "*.example.com"],
+    www_redirect=True,
 )