RssReader - Bug or Feature?

As you may know from an early entry on my Recycled Electrons blog, I use the RSS Reader news reader.

It is fantastic for keeping up with updates to blogs. Oh yeah - and other news sources too :).
Most of my friend's blogs are in my RSS reader.

But for some reason, old entries kept popping up again on my RSS feed. I didn't understand why that happened. It was kinda bugging me. I was wondering if it was doing that because the authors were updating the posts. (And I hoped I wasn't driving people nuts with all the template changes, and occasional spelling fixes I put in.)

Then just today, it hit me! Yes, the entries were being updated. But the updates were when people added comments. DOH!!

RSS does show two dates: the original date, and the update date, so if you watch for changes in those two fields, you can tell it was an update, and likely due to a comment. At least I think this is true for blogger blogs. I don't think I've seen this on other sites.

Bug or feature? I thought it was a bug - but now I know to look for a new comment - Feature!