It would be very nice when you are able to add some notation stencils. With that option you'll get more information about specific objects on a mockup. It would be very helpful when giving a presentation of my mockups
We’re happy to announce that the new Moqups Beta (available at https://app.moqups.com) comes with a revamped comments feature that allows you to have conversations on specific spots on the page. They can be used to annotate the design and explain things.
Additionally, we have arrows and callouts that can be used for the same purpose, with the advantage of being embedded in the design itself (e.g. they get exported in the design when you save it as PDF or PNG)
Hope this helps!
Dan from Moqups