  We discuss the relation between the "compositeness" of an s-wave bound state,
as derived from a related partial wave scattering amplitude, and the
corresponding spatial probability densities, for the case of spherically
symmetric, energy-independent finite-range potentials in non-relativistic
quantum mechanics. We find that in this simple case "compositeness" is a
measure for the probability to find the constituents separated by a distance
greater than the interaction range.
