It's going from increasing to decreasing, or in this case, from decreasing to increasing, which tells you that this is likely an inflection point. Now let's think about the second derivative. So right over here, this is the derivative of the derivative, and I could zoom out to look at the whole thing. You actually can't see the whole thing right over here. Actually, I can zoom out a little bit more so that you can really see what's going on. And so what's interesting here? Well, it looks like right at x equals negative one, we cross, our second derivative crosses the x-axis.