  Very recently, it was shown by Ghosh, Kar, Roy and Sen (\emph{Entanglement
vs. Noncommutativity in Teleportation}, quant-ph/0010012) that if it is \emph{a
priori} known that the state to be teleported is from a commuting set of
qubits, a separable channel is sufficient. We show that 1 ebit of entanglement
is a necessary resource to teleport a qubit even when it is known to be one of
two noncommuting states.
