Notice that it actually drops below the negative 70 millivolts value. And that's because many of these voltage gated potassium ions actually open. And so we have this outflux of these potassium ions out of the cell, and that causes a hyperpolarization period. So hyperpolarization basically means it drops the value below that resting memory potential to a value of about negative 80 millivolts. So the inactivation of the sodium channels and at the same time, the opening of those potassium voltage gated on channels causes the outflux of positive charge out of that cell. And so this rapid drop causes hyperpolarization such that the membrane potential drops below the resting potential of negative 70 millivolts.