Unleash not working with Thunderstorm like Firestorm do

The suppot gem unleash is not being able to be put on the skill gem Thunderstorm. Seeing the text on the 2 gems seems to me that Unleash should be able to suppot thunderstorm. The same way that can can suppot Firestorm. Hope you guys can see about that patch us this fix. I imagine that is a easy one to fix.