CH - although it can be annoying to have someone post up in your ad, and I am sure Roy didn't mean to imply you were pulling a fast one, it is always advisable with these sales to highlight any potential issues with photos or at the least a description. Even if it's extremely unlikely to be a problem, if there are the foundations of a possible problem, people ought to be made aware at least.
Most of us have bought and sold bikes and parts on here that have issues of some description, dents etc, it's just decent to highlight it in the listing. It's only fair to the buyer. And it will make your life easier as a seller as everything is up front and open.
Good luck with the sale, it's a lovely frame.