  We discuss a method of calculating analytically the asymptotic form of
quasi-normal frequencies for large AdS black holes in five dimensions. In this
case, the wave equation reduces to a Heun equation. We show that the Heun
equation may be approximated by a Hypergeometric equation at large frequencies.
Thus we obtain the asymptotic form of quasi-normal frequencies in agreement
with numerical results. We also present a simple monodromy argument that leads
to the same results. We include a comparison with the three-dimensional case in
which exact expressions are derived.
