The edges are pretty sloppy, so I recommend adding an extra stitch (at the minimum) on each side to neaten it up. Personally, I would add a seed stitch border, about 3-4 stitches on each side in addition to a few seed stitch rows at the top and bottom, which is my go-to method of preventing sloppy edges. Depends on your taste and what you plan to use the stitch for, of course!
Cast on a multiple of 2 +1
Row 1: K1, P1 across row
Row 2: Work each stitch as it appears - knit the knits, purl the purls
Rows 3 and 4: Knit all stitches
Repeat these 4 Rows for pattern
Here is the video. Happy Knitting, and Enjoy!