the works above rely on the implicit assumption that any physical set of correlations must be closed under wirings. this means that any effective box built by combining the inputs and outputs of a number of boxes within the considered set must also belong to the set. closure under wirings does not seem to enforce any limit on the maximum value of chsh. however, it is not a void principle: on the contrary, in it is shown that many simple, intuitive families of sets of correlations in probability space happen to violate it.