The recent paper by Ziauddin and Qamar [Phys. Rev. A 85, 055804 (2012)] proposes control of the Goos-Hänchen shift of a Gaussian field incident on a cavity containing duplicated two-level atoms. This control relies on phase control of the optical response of the intracavity medium that has been demonstrated earlier [Phys. Rev. Lett. 101, 213601 (2008)]. We show that the authors make an incorrect use of the results of this latter paper.