diff --git a/README.md b/README.md
index e07080f..8de6925 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,9 @@ If no routes match a request path, you can specify another instance of `RequestH
 public function setFallback(RequestHandler $requestHandler): void
 ```
 
+> **Note**
+> Middleware defined by `Router::stackMiddleware()` will _not_ be invoked when a request is forwarded to fallback handler. Use `Amp\Http\Server\Middleware\stackMiddleware()` to wrap the fallback request handler with any middlewares needed first.
+
 ## Example
 
 ```php