So once we form the RNA primer, as our DNA polymerase moves this way, we see that our nucleotides are basically formed in the backward direction going this way. So as our DNA polymerase moves this way along our parent strand that runs from the three to five, the one that runs from the five to three, it takes place in the opposite direction going this way. So we form backwards with respect to the movement of our helicas. 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.