Setting Articles to Private

I use the knowledge base on my company site with no issues at all. I am now trying to use it on a clients’ site except I want the articles to be private (so only admins and editors can view them).

Setting the main page to private works great but if I set the articles to private, they don’t show up in the directory at all.

How can I set it up so all of the articles show up for authorized users but nobody else?

Kevin