  We use an estimator of quantum criticality based on the entanglement entropy
to discuss the ground state properties of the 1D anisotropic Kondo necklace
model. We found that the T=0 phase diagram of the model is described by a
critical line separating an antiferromagnetic phase from a Kondo singlet state.
Moreover we calculate the conformal anomaly on the critical line and obtained
that c tends to 0.5 as the thermodynamic limit is reached. We conclude that
these transitions belong to Ising universality class being, therefore, second
order transitions instead of infinite order as claimed before.
