QoL tooltip change for Ryze's passive

Currently, Ryze's passive tells what percent increase mana he gets from AP. For example, if he has 300 AP, it would say he gets 15% bonus mana.

The problem is, I'm told the mana multiplier, but I'm not told how much raw mana he gets before hand. So the amplification percent doesn't help much at all if I don't know what it's multiplying. Sure, I can see that my max mana is at 115%, and try to divide it, but if I was good at math I wouldn't be making silly financial decisions like buying RP for skins.

Seriously though, it would be a nice change to show his raw mana and/or the amount he gains from his passive and Seraph's (optional).