[Ietf-calsify] 3.3.10. Recurrence Rule - typo or ambiguity?

[Andrew N Dowden]

3.3.10.  Recurrence Rule

          .. The
      numeric value in a BYDAY rule part with the FREQ rule part set to
      YEARLY corresponds to an offset within the month when the BYMONTH
      rule part is present, and corresponds to an offset within the year
      when the BYWEEKNO or BYMONTH rule parts are present.

Should the last line read?:

     .. BYWEEKNO or BYMONTHDAY rule parts ..
or
    .. BYWEEKNO or BYYEARDAY rule parts ..

Alternatively, does this make sense as is?

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