Flashlight Aim Ahead script

using UnityEngine;
using System.Collections;

public class AimFlashlight : MonoBehaviour {

    public Transform cam;
    public float rayLength = 100;
    public LayerMask mask;

    void Update () {

        Ray ray = new Ray( cam.position, cam.forward );
        RaycastHit hit;

        if (Physics.Raycast(ray, out hit, rayLength, mask))
        {
            transform.LookAt( hit.point );
            Debug.DrawLine( ray.origin, hit.point, Color.red );
        } else {
            Debug.DrawRay( ray.origin, ray.direction*rayLength, Color.green );
        }

    }
}