  In this note, we present an eighth-order derivative-free family of iterative
methods for nonlinear equations. The proposed family shows optimal eight-order
of convergence in the sense of the Kung and Traub conjecture \cite{5} and is
based on the Steffensen derivative approximation used in the Newton-method. As
a final step, having in mind computational purposes, a derivative-free
polynomial base interpolation is used in order to get optimal order of
convergence with only four functional evaluations. Numerical esperiments and
few issues are discussed at the end of this note.
