  In this note it is shown that, given a smooth minimal complex surface of
general type S with p_g(S)=0, K^2_S=3, for which the bicanonical map is a
morphism, then the degree of the bicanonical map of S is not equal to 3. This
completes our earlier results, showing that if X is a minimal surface of
general type with p_g=0, K^2>=3 such that |2K_X| is free, then the bicanonical
map of X can have degree 1, 2 or 4.
