  The power correction, surviving the zero quark mass limit and found earlier
to restore the validity of Burkhardt-Cottingham sum rule, provides the
contribution to the Bjorken sum rule as well. The leading perturbative
correction to the Bjorken sum rule is increased by the factor 4/3 for light
quarks and 5/3 for heavy quarks. The resulting value for the Bjorken sum rule
for light quarks is in excellent agreement with the most precise SLAC data. The
same correction should appear in the case of the Gross-Llewellyn Smith sum
rule. It completely removes the observed deficit of this sum rule within the
experimental errors.
