Two-loop O(αs2) correction to the H → bb decay rate induced by the top quark

We present the two-loop QED and QCD corrections to the f fH Yukawa coupling that are induced by the exchange of a virtual photon or gluon, respectively, with a heavy-fermion loop inserted. As an application, we study the corresponding O(αs2M2Hmt2) correction to the H → bb decay rate.