Unity 5 Water4 specular fit Sun

Hi! I am looking for a way to fit the specular of the Water4 from Standard Assets to the position of my directional light that is set to sun of scene! Do anyone know how to do it? It would come useful for me as I will need a day/night cycle in my game with that water!

If you simply select the Water4 and then drag your directional light onto the Specular Light under the script it should adjust