Stacy is measuring milk to make pancake batter. The recipe calls for \dfrac{3}{4} 4 3 ​ start fraction, 3, divided by, 4, end fraction of a jug of milk. She has \dfrac{1}{4} 4 1 ​ start fraction, 1, divided by, 4, end fraction of a jug now. How much more milk does she need?