Comment on "Additional Boundary Condition for Electric Quadrupolar Continua Derived from Maxwell's Differential Equations" by A.D. Yaghjian and M.G. Silveirinha.

The accuracy of the fundamental electric quadrupolar constitutive relation used in the paper by Yaghjian and Silveirinha (2016, https://doi.org/10.1002/2016RS006066) is determined and used to improve upon the derivation of one of the boundary conditions for electric quadrupolar media. In addition, three typographical errors in the aforementioned paper are noted. Key Points: The accuracy of expressions in the previous paper is determinedThe derivation of one of the boundary conditions in the previous paper is improvedTypographical errors in the previous paper are noted [ABSTRACT FROM AUTHOR]