diff --git a/README.md b/README.md
index a089fd6..d90d661 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ you can access the router in other areas in your application.
 After instantiating the router, you will need to define your routes and your route handlers:
 
 ```dart
-var usersHandler = Handler(handlerFunc: (BuildContext context, Map<String, dynamic> params) {
+var usersHandler = Handler(handlerFunc: (BuildContext? context, Map<String, List<String>> params) {
   return UsersScreen(params["id"][0]);
 });