After Stayman and responder does not find a major fit, a jump to four of a minor shows four of that minor, either 4441 or 4432 distribution and slam aspirations. With support, opener raises responder to 5 or 6 of the minor. Without support, opener may bid 4NT to announce 4333 distribution or opener may rebid 4 of a new suit to show a side 4 card suit.