title: High-aperture beams: comment.
abstract: Clarifications are provided for the proper choice of the branch of a square-root function that is connected with the singularity on the focal plane occurring in the treatment by Sheppard on 'High-aperture beams' [J. Opt. Soc. Am. A18, 1579 (2001)]. The author's claim that the singularity is nonphysical is disputed.
authors.affiliation: s.r.seshadri@osa.org
authors.forename: S R
authors.initials: SR
authors.lastname: Seshadri