So let's suppose that the resting potential so the electrical potential difference between the two sides of the membrane in this particular case is negative 45 millivolts millivolts. And what that basically means is this quantity here is more negative than this quantity here, as we show in this particular case. Now, we know that on the outside, we're going to have a larger concentration of sodium ions than on the inside. And before we actually calculate anything, the question is, will these sodium ions actually move from this side to this side of that cell membrane? So what we see is, because we have a higher positive charge on this side, these ions will tend to move into that cell. So in this direction.