Page 120, second full paragraph (beginning AT THE SAME TIME), the  phrase in the second sentence "to the next purl stitch" should be replaced by "until 2 stitches before end of round." The full  corrected sentence should read: "On every 4th round, knit 1,  increase 1, work in pattern until 2 stitches before end of round, increase 1, knit 1."