[Plugin: WordPress SEO by Yoast] How to Autogenerate Descriptions with WordPress SEO?

Hello, Is there a way to Autogenerate Descriptions in WordPress SEO by Yoast ..this plugin is indeed the best one, i want to use autogenerate descriptions also, what should i do ? should i use another plugin for the purpose of autogenerate descriptions together with WordPress SEO?

Thanks

http://wordpress.org/extend/plugins/wordpress-seo/