Listed item, where to add company specific info?

I have made some listings on products we are going to sell. I have written the manufactuers name, brand name etc but no mentioning of our company since it is not our brand. As I understand it, other sellers are free to connect to this listing as long as it is the same product, same EAN etc.

I want somehow to add that we have a little more to offer our customers (like a manual in other languages availabe which is not included in the stadard product in the listing). How would I do that? Is it at all possible?

We have a PRO account.