Doesn't the pattern state how to make holes for the cord? It sounds like a row of yarn overs, with dropping the yo's on the next row, followed maybe by another row of knitting/purling or k2 p2 (knit one, yo, k1, yo,..., then k(or purl) one, drop yo, k/p1, drop yo,...)
That would make a row of holes. Though, without pattern or picture, it's hard to tell.
Do you have the link to the pattern?