Editing long count for submitted articles

[PhilipForbes]

I just submitted my first article. Is there any way to edit the long count now that it's submitted?
The default 33% only shows the intro and a couple sentences after. I don't really feel that's a good representation of the work as a whole. As a first time seller, I need to make the long count for this article longer so potential buyers can really see what they're getting.

Is that possible?