And that's why it shoots up. And this is known as the depolarization period, because we change the charge values on that cell membrane. So before, during the resting memory potential, the inside was negative, the outside was positive, and now it essentially reverses. So the inside becomes positive, the outside becomes negative. And that's where we're in this period here. So it reaches a peak of about positive 30 millivolts and it never actually reaches this value here.