  The reverberation associated with the iron line is the time lag between
direct photons from the corona and the photons reflected from the disk. The
resulting line spectrum is called the 2D transfer function. The shape of the 2D
transfer function is determined by the geometry of spacetime and the properties
of BH. In a paper (Ghasemi-Nodehi and Bambi in EPJC 76:290, 2016), the authors
have proposed a parametrization. This parametrization is aimed to test the Kerr
nature of astrophysical black hole candidates. In this paper, I provide a
reverberation mapping of the Ghasemi-Nodehi-Bambi metric in order to constrain
the parameter of spacetime. All parameters can be constrained with the
exception of b11. The parameter b4 is harder to constrain too.
