Set minimum/maximum value for Joint properties

Hello

How to define min/max value for this example? Im changing distance of DistanceJoint2D per Keyboard but need min value to be 2 and max value 10 because of the object leaving the gaming screen. Im new in Unity and this may be a very basic question, so I would also be happy about a hint and I will google myself. Thanks

 public DistanceJoint2D playerJoint;

 void Start()
 {
     playerJoint = GetComponent<DistanceJoint2D>();
     playerJoint.distance = 3;
 }

 void Update()
 {
     if (Input.GetKey(KeyCode.Q)) {
         playerJoint.distance += 1.0f;
     }
     if (Input.GetKey(KeyCode.E)) {
         playerJoint.distance -= 1.0f;
     }
 }