starting increases for sleeves

it wouldnt matter all that much if i did this wrong but im gonna ask anyways-

so i finished the cuff and im starting to work up the sleeve on my sweater now and it says

“work 4 rows.
inc. 1 st. at each end of needle on the next and every following 4th row until…”

ive worked 4 rows, now do i increase on the next row or increase on the next 4th row?

thanks!

Increase on rows 4, 8, 12 etc