What version are you running? 2.0.3 What's the URL of the page this enhancement relates to, if any? http://host/reviewboard/r/xxx/diff/ Describe the enhancement and the motivation for it. I'd love the ability to mark different parts of a file as read, so that I can scroll around in the review, or exit the page and return, and not worry about losing my place. What operating system are you using? What browser? Funtoo Linux, Chromium.