I just installed this. How do I know when a comment is new? I just looked at a few threads i hadn't opened before and I was expecting all of them to have the "n

I just installed this. How do I know when a comment is new? I just looked at a few threads i hadn't opened before and I was expecting all of them to have the "new" UI element but they all looked normal (other than the new UI that the plugin brings for all of HN) edit: and as I post this, my own post is marked as new. For those interested, new posts seem to be denoted by an border on the left