diff --git a/docs/generator.md b/docs/generator.md
index 60f87bd..bb4e0c6 100644
--- a/docs/generator.md
+++ b/docs/generator.md
@@ -62,6 +62,24 @@ Generator函数的本质，其实是提供一种可以暂停执行的函数。yi
 
 yield语句与return语句有点像，都能返回紧跟在语句后面的那个表达式的值。区别在于每次遇到yield，函数暂停执行，下一次再从该位置继续向后执行，而return语句不具备位置记忆的功能。
 
+Generator函数可以不用yield语句，这时就变成了一个单纯的暂缓执行函数。
+
+```javascript
+
+function* f() {
+  console.log('执行了！')
+}
+
+var generator = f();
+
+setTimeout(function () {
+  generator.next() 
+}, 2000);
+
+```
+
+上面代码中，只有调用next方法时，函数f才会执行。
+
 ## next方法的参数
 
 yield语句本身没有返回值，或者说总是返回undefined。next方法可以带一个参数，该参数就会被当作上一个yield语句的返回值。
diff --git a/docs/promise.md b/docs/promise.md
index 1c8193d..0dc1cc7 100644
--- a/docs/promise.md
+++ b/docs/promise.md
@@ -61,8 +61,11 @@ var getJSON = function(url) {
 
     function handler() {
       if (this.readyState === this.DONE) {
-        if (this.status === 200) { resolve(this.response); }
-        else { reject(this); }
+        if (this.status === 200) { 
+			resolve(this.response); 
+		} else { 
+			reject(this); 
+		}
       }
     };
   });
@@ -118,6 +121,7 @@ getJSON("/posts.json").then(function(posts) {
   // some code
 }).catch(function(error) {
   // 处理前一个回调函数运行时发生的错误
+  console.log('发生错误！', error);
 });
 
 ```
diff --git a/docs/reference.md b/docs/reference.md
index 21bf149..ed5dac8 100644
--- a/docs/reference.md
+++ b/docs/reference.md
@@ -31,11 +31,13 @@
 - Matt Baker, [Replacing callbacks with ES6 Generators](http://flippinawesome.org/2014/02/10/replacing-callbacks-with-es6-generators/)
 - Steven Sanderson, [Experiments with Koa and JavaScript Generators](http://blog.stevensanderson.com/2013/12/21/experiments-with-koa-and-javascript-generators/)
 - jmar777, [What's the Big Deal with Generators?](http://devsmash.com/blog/whats-the-big-deal-with-generators)
+- Marc Harter, [Generators in Node.js: Common Misconceptions and Three Good Use Cases](http://strongloop.com/strongblog/how-to-generators-node-js-yield-use-cases/): 讨论Generator函数的作用
 
 ## Promise对象
 
 - Jake Archibald, [JavaScript Promises: There and back again](http://www.html5rocks.com/en/tutorials/es6/promises/)
 - Tilde, [rsvp.js](https://github.com/tildeio/rsvp.js)
+- Sandeep Panda, [An Overview of JavaScript Promises](http://www.sitepoint.com/overview-javascript-promises/): ES6 Promise入门介绍
 
 ## 工具