Let $X$ be a projective algebraic manifold of general type whose canonical ring $R={\displaystyle\oplus_{n\in\mathbb{N}}}H^{0}(X,\omega_{X}^{n})$ is of finite type. Then the canonical model of $X$, $X_{can}:=Proj(R)$ has only canonical singularities. If $N=Index(X_{can})$ then $\omega^{[N]}_{X_{can}}$ is ample.