  We examine the processes which could lead to the observed enhancement of Li
and possibly other light elements (Be, B) in the companions of a number of
X-ray novae. We conclude that one of the most promising mechanisms is the
spallation of CNO elements on the surface of the companion induced by the
neutron flux produced in the hot accretion flow onto the compact object. Direct
production of the observed Li and its deposition onto the dwarf companion seem
less likely, mainly because of the possibility of its destruction in the
production region itself and difficulties in its deposition associated with the
configuration of the companion's magnetic field. We discuss other potential
observables of the above scenario.
