Small Chip in cylinder wall

As i was looking at my engine block the other night, i realized that on cylinder 2, at the very bottom of the cylinder there is a small chip missing in the cylinder wall. It is probably smaller than a 1/4 inch in diameter, and is at the very bottom of the bore. I am worried about this. Should this be a big concern? I dont think that the rings go down that far in the bore, so that shouldn't be a problem. Does anyone know if this will work like this or should i take it to a machine shop to get a sleeve put in?

Thanks