Just pushed a new change tonight that adds this new piece of UI:
Some background: there is a HTML tag called <link> that Web site operators can add to their pages that directs RSS reader software to the correct feed to use. Websites can have more than one of these, each of them referring to a different RSS or Atom feed. In the past, newsrdr simply chose the first RSS feed found when a user adds a URL to a Web page, which wasn't always the one the user wanted. This feature means that users can now choose the correct feed to add (or even all of them if they wanted).
For more details on what exactly changed in the code, see the commit on Github.