Cast on 5 stitches.
Beginning with a knit (right side) row, work in Stockinette stitch for 24 rows (this means that your last row will be a purl row).
Next Row (make Keyhole): Knit 2, work a yarn over as follows: bring the yarn to the front between the needles, then take yarn over the right needle to the back, knit 2 stitches together, knit 1.
Next Row: Purl, purling into the yarn over just as you would purl any stitch.
Work in Stockinette stitch for 4 more rows.
With fingers, weave yarn tails in and out of stitches to hide the tails.