Intro and knitting question

Hi, everyone. A quick intro before I jump into my question. I'm a lurker here, for the most part, but I think I've posted once or twice in the past. I'm a longtime crocheter and relatively new knitter. Currently, I have five projects going: two crocheted afghans, a knitted prayer shawl (almost done), a knitted poncho for my niece, and a knitted sweater for my son.

I'm continually in awe of the expertise and willingness to help exhibited on this newsgroup. I'm hoping one of you kind folks can explain a pattern direction to me. It's the Hoover baby blanket featured in knitty.com. The URL is

. It's a double knitted blanket with a garter stitch border. The part that confused me is this paragraph: "A further caveat regarding the border: Since Garter and Stockinette have different row gauges, it may be wise to add extra border rows, particularly if you have a wide border. This can be done by knitting back and forth twice on the border at regular intervals [every 6th or 8th row]. Be sure that you add to the borders equally at each side however, so your blanket does not become lopsided. Mrs. Hoover is rather vague on this point, but invites the knitter to decide."

I don't quite understand what she means by "knitting back and forth twice on the border." How exactly does that work? I'm trying to visualize it in my head before starting this project (as if I needed another project!).

Thanks for any help you can give.

Jules