And that's exactly why we have this positive charge and increase in our membrane voltage potential. So we see that this will cause the movement of sodium ions into the cell, which will lead to the depolarization of that membrane. So depolarization simply means our polarity of the cell membrane switches. So at the resting membrane potential, we had an internal negative and an external positive. But when we depolarize, the inside becomes positive. So it goes from negative to positive, and the outside goes from positive to negative.