Let $(M,J,g,\Omega)$ be a Calabi–Yau $m$-fold, and $L$ a compact SL $m$-fold in $M$. Then the moduli space ${\mathbin{\cal M}}_{\scriptscriptstyle L}$ of special Lagrangian deformations of $L$ is a smooth manifold of dimension $b^{1}(L),$ the first Betti number of $L$.