  In view of recent measurements of the mixing angle \theta_{13} a possibility
to determine the difference of two CP Majorana phases of the neutrino mixing
matrix from the study of neutrinoless double-beta decay is investigated. We
show that in the case of the inverted hierarchy of neutrino masses it might be
possible if neutrinoless double-beta decay will be observed. The required
experimental accuracies and uncertainty in the calculated nuclear matrix
elements of the process are discussed.
