Shifting stories

Check this out-- two different versions of the same story posted on the Washington Post yesterday.

I find this striking not so much because of the story itself, but because of the phenomenon of news stories changing after they've been posted. This is something that happens every once in a while. What I find a little disconcerting is that there's no record of the change. Were someone to link to the earlier version with some commentary, it might not make sense later on if the original story changes. I have no problem with revisions being made to a story, but there should really be some sort of trail to follow to earlier (or later) versions of the story. Ideally, there should also be some sort of commentary by the authors as to why the changes were made.