So we basically form going this way. This goes here, this goes here, this goes here and this goes here. So this is known as the lagging strand because it lags behind the leading strand. So the leading strand is formed continuously and our DNA polymerase moves in the same direction as the motion of the fork, as the motion of our helicase. But for the lagging strand our direction of the DNA polymerase is backwards, it's reversed. And this is important because it basically ensures that the DNA polymerase forms in the five to three directions.