  In a recent work Zhang, Li and Noh [Phys. Lett. B {\bf 694}, 177
(2010)]proposed a model for dark energy assuming this component strictly obeys
the holographic principle. They performed a dynamical system analysis, finding
a scaling solution which is helpful to solve the coincidence problem. However
they need explicitly a cosmological constant. In this paper we derive an
explicit analytical solution, without $\Lambda$, that shows agreement with the
Supernovae data. However this solution is not physical because violate all the
energy conditions.
