  An error estimate for the Gauss-Lobatto quadrature formula for integration
over the interval $[-1, 1]$, relative to the Jacobi weight function
$w^{\alpha,\beta}(t)=(1-t)^\alpha(1+t)^\beta$, $\alpha,\beta>-1$, is obtained.
This estimate holds true for functions belonging to some Sobolev-type subspaces
of the weighted space $L_{w^{\alpha,\beta}}^1([-1,1])$.
