README.md in rails-routes-js-utils-3.0.0 vs README.md in rails-routes-js-utils-4.0.0

@@ -30,12 +30,12 @@
 Routes.blog_post_path({id: 123})
 Routes.blog_posts_path()
 
 for (var i=0; i<AllRoutes.length; i++){
     var route = AllRoutes[i];
-    var subdomain = document.location.hostname.split('.')[0];
+    var host = document.location.hostname;
     var pathname = document.location.pathname;
-    if (route.path.test(pathname) && route.subdomain.test(subdomain)) {
+    if (route.path.test(pathname) && route.host.test(host)) {
         // Matched route
         console.log(route);
         var controller = route.reqs.controller;
         var action = route.reqs.action;
         var parts = route.reqs.parts;