diff --git a/docs/function.md b/docs/function.md
index 49694d3..5c15225 100644
--- a/docs/function.md
+++ b/docs/function.md
@@ -18,6 +18,25 @@ var p = new Point();
 
 任何带有默认值的参数，被视为可选参数。不带默认值的参数，则被视为必需参数。
 
+利用参数默认值，可以指定一个参数不得省略，如果省略就抛出一个错误。
+
+```javascript
+
+function throwIfMissing() {
+        throw new Error('Missing parameter');
+    }
+
+function foo(mustBeProvided = throwIfMissing()) {
+        return mustBeProvided;
+}
+
+foo()
+// Error: Missing parameter
+
+```
+
+上面代码的foo函数，如果调用的时候没有参数，就会调用默认值throwIfMissing函数，从而抛出一个错误。
+
 ## rest（...）运算符
 
 ES6引入rest运算符（...），用于获取函数的多余参数，这样就不需要使用arguments.length了。rest运算符后面是一个数组变量，该变量将多余的参数放入数组中。
diff --git a/docs/object.md b/docs/object.md
index 7d6da97..12ba8c0 100644
--- a/docs/object.md
+++ b/docs/object.md
@@ -197,6 +197,10 @@ proxy.title // 35
 
 ```javascript
 
+var person = {
+    name: "张三"
+};
+
 var proxy = new Proxy(target, {
         get: function(target, property) {
             if (property in target) {
@@ -207,6 +211,9 @@ var proxy = new Proxy(target, {
         }
 });
 
+proxy.name // "张三"
+proxy.age // 抛出一个错误
+
 ```
 
 上面代码表示，如果访问目标对象不存在的属性，会抛出一个错误。如果没有这个拦截函数，访问不存在的属性，只会返回undefined。
diff --git a/docs/reference.md b/docs/reference.md
index 8d3ea85..0c204b8 100644
--- a/docs/reference.md
+++ b/docs/reference.md
@@ -16,6 +16,8 @@
 - Nick Fitzgerald, [Destructuring Assignment in ECMAScript 6](http://fitzgeraldnick.com/weblog/50/)
 - Nicholas C. Zakas, [Understanding ECMAScript 6 arrow functions](http://www.nczonline.net/blog/2013/09/10/understanding-ecmascript-6-arrow-functions/)
 - Jack Franklin, [Real Life ES6 - Arrow Functions](http://javascriptplayground.com/blog/2014/04/real-life-es6-arrow-fn/)
+- Axel Rauschmayer, [Handling required parameters in ECMAScript 6](http://www.2ality.com/2014/04/required-parameters-es6.html)
+- Nicholas C. Zakas, [Creating defensive objects with ES6 proxies](http://www.nczonline.net/blog/2014/04/22/creating-defensive-objects-with-es6-proxies/)
 
 ## Generator
 
diff --git a/js/ditto.js b/js/ditto.js
index d023590..73fef7e 100644
--- a/js/ditto.js
+++ b/js/ditto.js
@@ -200,7 +200,8 @@ function router() {
             Prism.highlightElement(this);
         });
 
-		function loadDisqus() {
+		// 加载disqus
+		(function () {
 			// http://docs.disqus.com/help/2/
 			window.disqus_shortname = 'es6';
 			window.disqus_identifier = (location.hash?location.hash.replace("#", ""):'READEME');
@@ -210,11 +211,10 @@ function router() {
 			// http://docs.disqus.com/developers/universal/
 			(function() {
 				var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
-				dsq.src = 'http://es6.disqus.com/embed.js';
+				dsq.src = 'http://'+window.disqus_shortname+'.disqus.com/embed.js';
 				(document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);
 			})();
-		}
-		loadDisqus();
+		})();
 
 		if(path.indexOf('README') === -1){
 			$('html, body').animate({