diff --git a/axum/src/docs/middleware.md b/axum/src/docs/middleware.md
index 8ae44ff1..0d1245ec 100644
--- a/axum/src/docs/middleware.md
+++ b/axum/src/docs/middleware.md
@@ -229,6 +229,7 @@ use futures::future::BoxFuture;
use tower::{Service, Layer};
use std::task::{Context, Poll};
+#[derive(Clone)]
struct MyLayer;
impl<S> Layer<S> for MyLayer {
@@ -258,7 +259,7 @@ where
self.inner.poll_ready(cx)
}
- fn call(&mut self, mut request: Request<Body>) -> Self::Future {
+ fn call(&mut self, request: Request<Body>) -> Self::Future {
let future = self.inner.call(request);
Box::pin(async move {
let response: Response = future.await?;