But that's not the most important factor that actually determines this quantity. The more important factor is the following. It turns out that the potassium ion channels are actually more permeable to potassium than the sodium ion channels are permeable to sodium. In fact, we actually have these potassium ion channels that are open within that membrane. And if we have some of these potassium ion channels open along that resting membrane, what that means is we'll have a movement, a leakage of these K plus ions out of that cell. And that leakage will basically drive this value to a more negative value.