jquery .html works but .add doesn't
<p>my code:</p>

<pre><code>$(document).ready(function() {
    $(this.body).html("&lt;p&gt;using .html&lt;/p&gt;"); // works
    $(this.body).add("&lt;p&gt;using .add&lt;/p&gt;"); // doesn't work
});​
</code></pre>

<p><a href="http://jsfiddle.net/ZLzw8/" rel="nofollow">some jsfiddle</a></p>

<p>What am I doing wrong?</p>
