Whenever you post your next resource, please make it exceptionally clear that overclocking will void a user's warranty.
I am not sure that is necessary as most mining rig owners know that OC'ing voids the warranty.
In any case, it is bitmain's responsibility to advise its customers about the terms of the warranty, and to my knowledge, I have never seen any official bitmain literature to that effect, bearing in mind that the so called overclocking frequencies ship as selectable options (on the S5 at least)!