Turning the heel is a common method for making the little cup your heel actually sits in when you wear the sock. It's accomplished using short rows, meaning that you turn the work and knit back over the stitches you just worked without fully knitting across the row.
In the case of this sock, the turning happens with only one stitch unworked, so there's no time to feel intimidated! As before, slip the stitches purlwise.
Here's how you turn the heel:
Row 1: Slip 1, purl 5, purl 2together, purl one. Turn the work, leaving one stitch unworked.
Row 2: Slip 1, knit 3, slip, slip, knit, knit 1. Turn the work, leaving one stitch unworked.
Row 3: Slip 1, purl 4, purl 2 together. Turn the work. There are no unworked stitches.
Row 4: Slip 1, knit 4, slip, slip, knit. There are no unworked stitches. Six stitches remain on the needle.
See, nothing to it!
