Corrections and Additions
Ashley suffered a debilitating stroke the year after his magnum opus was published. He was not able to produce an erratum or oversee a corrected edition. Corrections submitted by the International Guild of Knot Tyers were incorporated in 1991. The original list of revisions submitted to the publisher is believed to have been lost, but many had been collected from a series of articles in the Guild's quarterly publication, Knotting Matters. Additional errors have been identified since the 1991 corrections.
At least one knot, the Hunter's bend (#1425A), was added in 1979.
Read more about this topic: The Ashley Book Of Knots