  We derive the anharmonic correction to the hyperon energy in the bound state
version of the topological soliton model for the hyperons, and show that it
represents a negative correction of at most 10% to the energy of the bound
heavy flavour two-meson system in the case of cascade hyperons. The main
anharmonic correction arises from the mass term in the Lagrangian density. For
large meson masses the consistency of the model requires that the anharmonic
correction decreases as the inverse square root of the mass of the heavy
flavour meson.
