Ask HN: Do comments with higher word count rank higher?

I have noticed the following when editing one of my HN comments: I submit a comment. Initially ranks mid page. I edit the comment a few minutes later. Comment stays in same rank position. I edit the comment again, this time adding words. Comment moves upwards in position.<p>Why? Does it move up on word count or number of edits or both or other?<p>Obviously I may just be seeing things.