Decorator pattern in c# without Inheritance. Is this correct?

 public interface IMovable
    {
        void Move();
    }

    public interface IUnloadable
    {
        void Unload();
    }

    public class Vehicle : IMovable
    {
        public void Move()
        {
            Console.Write("moving");
        }
    }

    public class Truck : IMovable, IUnloadable
    {
        private Vehicle Veh;

        public Truck(Vehicle veh)
        {
            this.Veh = veh;
        }

        public void Move()
        {
            Veh.Move();
            Console.Write("reverse with beepy noise as well");
        }

        public void Unload()
        {
           Console.Write("Unload");
        }
    }

If this is the decorator pattern. What is the difference between the decorator pattern and composition? I seen examples of this pattern where there is inheritance used. For instance the java example on wikipedia but I dont see the need to use inheritance at all, or am I missing something?