 The shift in question involves an increase in information, although not necessarily an increase in probability. Given that Salmon does not require relevance to be positive, the procedure described can result in a higher as well as a lower probability of the explanandum. In this perspective what counts for the sake of explanation is not high probability, as required by Hempel, but being in a position to assert that the probability distribution associated with the explanandum reflects the most complete and detailed information attainable. This information is conveyed by a homogeneous partition of the reference class, together with a statement specifying to which cell of that partition the explanandum event belongs.