(a) Where the applicant, in a notice submitted to the International Bureau, corrects or adds a priority claim under Rule 26bis, that Bureau shall enter the correction or addition in the request, draw a line through, while still leaving legible, any indication deleted as a result of the correction, and enter, in the margin, the letters "IB."
(c) The applicant, the receiving Office and the International Searching Authority shall be promptly notified by the International Bureau of any correction or addition of a priority claim under Rule 26bis and of the date on which it received such correction or addition.