Growing Swarm - Minion Question

The Notable node "Growing Swarm" in the upper quadrant of the passive tree says "Minions have 20% increased are of effect". Does this mean splash damage? I cannot find any node on the tree which offers minion splash damage by name, so I assumed this must be how they are expressing it.

Can anyone confirm this, as it would be key to know for sure before I commit the points if the node is going to do what I'm hoping it will do.

Cheers.

I have this sabe doubt!