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APPLIED MATHEMATICS Correction for ‘‘On the behavior of a capillary surface in a wedge,’’ by Paul Concus and Robert Finn, which appeared in issue 2, June 1, 1969, of Proc Natl Acad Sci USA (63:292–299). Owing to a printer’s error, the initial sentence of the abstract appeared as ‘‘Estimates above and below are obtained for the height of the equilibrium-free surface of a liquid’’ rather than the intended ‘‘Estimates above and below are obtained for the height of the equilibrium free surface of a liquid.’’ Also, the first sentence of the introduction, ‘‘Consider a volume of liquid that partially fills a cylindrical container Z, forming an equilibriumfree surface S, as determined by surface and gravitational forces’’ should have read ‘‘Consider a volume of liquid that partially fills a cylindrical container Z, forming an equilibrium free surface S, as determined by surface and gravitational forces.’’ These errors can lead to basic misunderstanding as to the nature of the problem addressed in the article. The online version of this article has been corrected.