Ask HN: How do stories get on to HN's RSS feed?

I've begun noticing that some stories with very few votes (only 1 or 2 sometimes) make it on to the RSS feed. Here are two examples: 3 points (2 votes): http://news.ycombinator.com/item?id=1187729 2 points (1 vote): http://news.ycombinator.com/item?id=1187709 Why does this happen? In answer to "How are stories ranked?" the FAQ says "On the front page, by points divided by a power of the time since they were submitted. Stories on the new page and comments on the comments page are listed chronologically." But what about the RSS feed? If the same criteria is used as on the front page, is just one single quick vote enough to get a story in to the feed?