We mentioned that one second, two second, three seconds. So we're starting moving to the left. And the convention is, if you're moving to the left, you have negative velocity. And if you're moving to the right, you have positive velocity. And you can see here, our velocity immediately gets more and more negative until we get to one second. And then it stays negative, but it's getting less and less negative until we get to two seconds. And at two seconds, our velocity becomes positive.