The slope, the derivative itself, isn't changing right at this moment. And then you see that the slope is increasing. And once again, we can visualize that on the second derivative. The derivative of the derivative, if the derivative is increasing, that means the derivative of that must be positive. And it is indeed the case that the derivative is positive. And we have a word for this downward opening u and this upward opening u. We call this concave downwards.