Let $(X,J,\omega,\Omega)$ be a Calabi–Yau $m$-fold, and $N$ a compact special Lagrangian submanifold of $X$. Then the moduli space $\mathcal{M}$ of special Lagrangian submanifolds in $X$ is near $N$ a smooth manifold of dimension $b^{1}(N)$, the first Betti number of $N$.