After editing my manuscript multiple times, I sent it to a professional editor for a final polish. In my submission letters to editors and/or agents, should I mention that I have had my ms professionally edited? Of course, the ms must stand or fall on its own, and I don't expect that mentioning a professional editor will give the ms any special advantage, but are editors/agents interested in knowing that a writer has gone the extra mile to make his/her ms the best it can be?No. Don't say anything about this... unless you plan not to send your next novel to a freelance editor, and to surprise your publisher with a less-polished-than-the-first-one manuscript. Then we would like some warning.