  We investigate the power-suppressed corrections to fragmentation functions in
flavour-singlet deep inelastic lepton scattering, to complement the previous
results for the non-singlet contribution. Our method is a dispersive approach
based on an analysis of Feynman graphs containing massive gluons. As in
non-singlet deep inelastic scattering we find that the leading corrections are
proportional to 1/Q^2.
