Showing hints in a matrix-style question

Is it possible to somehow show question hints for matrix-style questions? I’d like to have my form look simple on first view, but have hints/further explanations available if the user needs.

Not directly thru the Kobo form builder UI, but you could manually edit the resulting XLSForm to add hints. If you look at my earlier posting about how matrices are ultimately represented you should be able to figure out how to add additional hints (if not, please just re-post and ask).