I've created a page node for an about page. I've checked the node id of the node which is 11. I've created a file named page--node--11.tpl.php in my theme directory containing some test html but it's not overriding the standard page.tpl.php file. I've also tried using the following file names: page-node-11.tpl.php page-node--11.tpl.php
I've cleared the cache but still no luck.
What am I missing?