normal family, punctured disk

Let $f(z)$ be analytic on the punctured disk $\{ 0 < |z| < 1 \}$, and define $f_n(z)=f(\frac{z}{n})$, $n \geq 1$. Show that $\{ f_n(z) \}$ is a normal family on the punctured disk if and only if the singularity of $f(z)$ at $0$ is removable or a pole.