  We evaluate the compositeness effects of tau lepton on the vertex
W-tau-nu(tau) in the context of an effective Lagrangian approach. We consider
that only the third family is composed and we get the corrections to the non
universal lepton coupling g_(tau)/g_(e). As the experimental bounds on non
universal lepton couplings in W decays are weak, we find that the excited
particles contributions do not give realistic limits on the excited mass, since
they lead to Lambda<m*.
