Boat Slips

Is there a place you can specify if you have a boat slip with your property. Either marking it as boat slip included or boat slip available for added fee placing under rooms and accommodations or amenities?
It would be easier for people to search who need a boat slip if it was include under a specified criteria just as when you are search waterfront or ocean view.

I would love this too—-and maybe a separate lease agreement on the dock.