[Plugin: Custom CSS for Posts and Pages (CCSS)] Adding custom post types

Great plugin! Works a treat. But what do you need to do to add other post types? I’ve added a line that includes the css dropdown in the admin:
add_meta_box( 'custom-css', 'Custom CSS for posts/pages (CCSS)', 'ccss_add_box', 'page', 'normal','high' );

But it’s still not adding the css to the page.

Any ideas????

http://wordpress.org/extend/plugins/custom-css-stylesheet-for-posts-or-pages/