update readme

README.md

@@ -50,4 +50,13 @@ Class added to the sticky item once it has reached the end of the container
 Do you already have a fixed horizontal header on the page? Offset stick 'em by that many pixels.
 
 **start: 0**<br>
-If your sticky item isn't at the top of the container, tell it where it should start being sticky.
+If your sticky item isn't at the top of the container, tell it where it should start being sticky.
+
+### Destroying
+
+If you have a bunch of stuff that happens after your page has loaded (e.g. AJAX requests) that changes the height of your containers and page, and you need to "destroy" stick 'em, do it like this:
+
+<pre>var sticky = $('.container').stickem();
+sticky.destroy();</pre>
+
+Then you can re-instantiate again if you need to.