Mathe Asking Bid

After responder makes a limit raise in support of a major opening, opener bids the next higher suit to ask for shortness (singleton or void).

After 1H-3H, opener bids 3S to ask for shortness. Responder bids 3NT to show shortness in spades, bids 4C/4D to show shortness in those suits, or bids 4H to show no shortness.
After 1S-3S, opener bids 3NT to request shortness. Reponder either bids suit to show shortness, or bids 4S.