This question was converted to community wiki by its most recent edit, which exceeded the threshold for number of editors. The message in the revision log is "[made Community Wiki by being edited by more than 5 different editors]".
What surprised me is that the triggering edit was made by the original poster. Is that correct behavior -- CW is triggered specifically by the number of editors, not writers, of a post, so the OP doesn't count unless he edits after posting? It does say "editors" in the CW-ification note in the revision history; I'm asking because I had previously thought it was the number of total people involved in the post, and I'm not sure where I got that impression.