diff --git a/index.d.ts b/index.d.ts
index 1bb1f95..772030c 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -218,10 +218,10 @@ declare class Router {
      * Handle requests
      *
      * @param {Request} request
-     * @param {any} extend
+     * @param {any=} extend
      * @returns {Response}
      */
-    handle(request: Request, extend: any): Response
+    handle(request: Request, extend?: any): Response
 }
 declare namespace Router {
     export { Route, RouterRequest, RouterResponse, RouterNext, RouterHandler, RouterCorsConfig }
diff --git a/index.js b/index.js
index 6de9333..71ca66a 100644
--- a/index.js
+++ b/index.js
@@ -309,7 +309,7 @@ class Router {
      * Handle requests
      * 
      * @param {Request} request
-     * @param {any} extend
+     * @param {any=} extend
      * @returns {Response}
      */
     async handle(request, extend = {}) {