diff --git a/react-router/react-router.d.ts b/react-router/react-router.d.ts
index 5df21529e6..dd4e59af1c 100644
--- a/react-router/react-router.d.ts
+++ b/react-router/react-router.d.ts
@@ -39,10 +39,10 @@ declare namespace ReactRouter {
     type RouteComponent = Component
 
     // use the following interface in an app code to get access to route param values, history, location...
-    // interface MyComponentProps extends ReactRouter.RouteComponentProps<{}, { id: number }> {}
+    // interface MyComponentProps extends ReactRouter.RouteComponentProps<{}, { id: string }> {}
     // somewhere in MyComponent
     // ...
-    //   let id = this.props.routeParams.id
+    //   let id = parseInt(this.props.routeParams.id, 10);
     // ...
     //   this.props.history. ...
     // ...