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. So for the lagging strand so let's designate it using our red color. This end is the five end and this end is the three end. So we see going this way we form the five to three end and this we form the five to three end.