Lattice calculations of f(D) and f(B)

The status of lattice calculations of the axial coupling of D and B mesons is reviewed. There are no clear cut quark model estimates and no experimental determinations which make lattice predictions interesting. The lattice prediction of f(sub D) is established. The value of f(sub B) is still the object of considerable discussion. The results obtained by extrapolation are consistent with the static limit and point to a large value of f(sub B), if it is accepted that sizeable violations of the scaling law are present at the charm scale.