Picking up heel flap stitches 1/2

Here's a video I made for my sister on how to pick up the heel flap stitches to create a nice edge that is solid and attractive.
Note: to use this method, when knitting the heel flap you need to PURL the last stitch of every row, and SLIP the first stitch of every row KNITWISE. This is what creates the nice braided edge along the sides of the flap.