diff --git a/index.html b/index.html
index 3ac282394..97cd8e031 100644
--- a/index.html
+++ b/index.html
@@ -748,10 +748,11 @@ _.functions(_);
 </pre>
 
       <p id="extend">
-        <b class="header">extend</b><code>_.extend(destination, source)</code>
+        <b class="header">extend</b><code>_.extend(destination, *sources)</code>
         <br />
-        Copy all of the properties in the <b>source</b> object over to the
-        <b>destination</b> object.
+        Copy all of the properties in the <b>source</b> objects over to the
+        <b>destination</b> object. It's in-order, to the last source will override
+        properties of the same name in previous arguments.
       </p>
       <pre>
 _.extend({name : 'moe'}, {age : 50});
diff --git a/underscore.js b/underscore.js
index 0a31cea03..1d835f357 100644
--- a/underscore.js
+++ b/underscore.js
@@ -432,11 +432,10 @@
     return _.filter(_.keys(obj), function(key){ return _.isFunction(obj[key]); }).sort();
   };
 
-  // Extend a given object with all the properties in given object(s)
+  // Extend a given object with all the properties in passed-in object(s).
   _.extend = function(obj) {
-    var prop;
-    each(_.rest(arguments), function (source) {
-      for (prop in source) obj[prop] = source[prop];  
+    each(_.rest(arguments), function(source) {
+      for (var prop in source) obj[prop] = source[prop];
     });
     return obj;
   };