diff --git a/examples/simple.js b/examples/simple.js
index 4829f1f..e45cc17 100644
--- a/examples/simple.js
+++ b/examples/simple.js
@@ -6,7 +6,7 @@ var app = koa();
 // x-response-time
 
 app.use(function(next){
-  return function *(){
+  return function *responseTime(){
     var start = new Date;
     yield next;
     var ms = new Date - start;
@@ -17,7 +17,7 @@ app.use(function(next){
 // logger
 
 app.use(function(next){
-  return function *(){
+  return function *logger(){
     var start = new Date;
     yield next;
     var ms = new Date - start;
@@ -28,7 +28,7 @@ app.use(function(next){
 // content-length
 
 app.use(function(next){
-  return function *(){
+  return function *contentLength(){
     yield next;
     if (!this.body) return;
     this.set('Content-Length', Buffer.byteLength(this.body));
@@ -38,7 +38,7 @@ app.use(function(next){
 // custom 404 handler
 
 app.use(function(next){
-  return function *(){
+  return function *notfound(){
     yield next;
     if (this.body) return;
     this.status = 404;
@@ -49,7 +49,7 @@ app.use(function(next){
 // response
 
 app.use(function(next){
-  return function *(){
+  return function *response(){
     yield next;
     if ('/' != this.url) return;
     this.body = 'Hello World';