So in this case, we went from negative to positive, but we could have also switched from being positive to negative. So inflection point, your second derivative, f prime prime of x, switches signs, goes from being positive to negative or negative to positive, switches signs. So this is a case where we went from concave downwards to concave upwards. If we went from concave upwards to concave downwards like that, then at this inflection point, up until that point, the slope was increasing. So the second derivative would be positive. And then the slope is decreasing. The derivative is decreasing.