So notice that our sodium voltage gated channels, shown in red, basically close. But the calcium voltage gated channels, the Ltype calcium channels, are still open. So because they're open, we still have a movement of positive charge the calcium into the cell. But now our potassium channels begin to open up, and we have a movement of potassium to the outside. And so what that basically means is, because we have a movement of the potassium onto the outside, initially the movement of potassium to the outside is higher than the movement of calcium to the inside. And so we have this decrease in our membrane potential.