diff --git a/lib/router.js b/lib/router.js
index e19d7dd..788118e 100644
--- a/lib/router.js
+++ b/lib/router.js
@@ -16,6 +16,7 @@
 'use strict';
 
 var Route = require('./route');
+var helpers = require('./helpers');
 
 function regexEscape(s) {
   return s.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
@@ -83,6 +84,11 @@ Router.prototype.add = function(method, path, handler, options) {
 
   var routeMap = methodMap.get(method);
   var regExp = route.regexp || route.fullUrlRegExp;
+
+  if (routeMap.has(regExp.source)) {
+    helpers.debug('"' + path + '" resolves to same regex as existing route.');
+  }
+
   routeMap.set(regExp.source, route);
 };