Add "Publicize" to Types CPT (Jetpack Publicize)

Ours is a self hosted blog using the Jetpack plugin. I have Jetpack Publicize enabled, and found this info on adding the Publicize feature to custom post types:

http://jetpack.me/2014/01/31/jetpack-2-8-introducing-markdown-and-improving-monitor/

which says:

"For our developer friends out there, we’ve added Publicize support for custom post types, allowing you and your clients to automatically post new entries from any CPT to your social media networks. You’d need to make one small tweak in the code defining the CPT—just add 'publicize' to the CPT’s 'supports' array.

For example, to enable the title, editor, Publicize, and Jetpack’s new support for Markdown: 'supports' => array( 'title', 'editor', 'publicize', 'wpcom-markdown' )"

Can I add "publicize" to Types CPTs? How do I do that?

Thanks,

kip