Errata for the small size:

Set up heel: work round 2 until 10 sts remain. Turn work.

Heel flap:
Row 1: (ws) sl 1wyif, p1, k1, p1 tbl, k1, p3, k1, p1 tbl, k1, p4, k1, p1 tbl, k1, p3, k1, p1 tbl, k1, p2.
Row 2: (rs) sl1 wyib, k1, p1, k1 tbl, p1, k3, p1, k1 tbl, p1, k4, p1, k1 tbl, p1, k3, p1, k1 tbl, p1, k2.