COE et al1 have reported that Cyg X-1 and the transient source A 0620-00 both display anticorrelated spectral variability. That is to say, flux enhancements at low energy (E <~ 10 keV) tend to be accompanied by a decline at high energy and vice versa. Both sources may be considered possible black holes; Cyg X-1 is well known, while the candidacy of A 0620-00 (≡ Nova Monocerotis 1975, distance □ 2 kpc)2,3 follows if its peak luminosity □ 5 × 1038 erg s-1 is identified with the Eddington limit luminosity 1.3 M/Msolar × 1038 erg s-1 for mass accretion. Thus the accreting object has a mass □ 4 Msolar, just greater than the accepted limiting mass for a neutron star. It has therefore been suggested1 that anticorrelated spectral variability, perhaps resulting from inverse Compton scattering in the accretion disk4,5 may be common to X-ray emitting binary systems which contain black holes. In this paper, we wish to show that anticorrelated variability is not confined to sources which are black hole candidates.