Propose HN: Pinned explaination when significant posts are buried

In interest of transparency, when front page posts are mod-buried, it would be great to have a pinned comment at the top explaining why. Especially when the news involves a YC company. I imagine it could look something like this:

- Post is a negative rumor, so it was removed from the front page. Full disclosure: YC invested in this company.

- Comment thread devolved into a flamewar, so it was removed from the front page.

I know this is done sometimes when comment threads are detached (great!) but how about doing that for posts that have significant traction when they are buried?