Find the value of constant so that the function defined as: is continuous at .

Find the value of constant $k$ so that the function $f(x)$ defined as: $f(x) = \begin{cases} \frac{x^2 - 2x - 3}{x + 1}, & x \ne -1 \\ k, & x = -1 \end{cases}$ is continuous at $x = -1$.