Storage Capacity on hover

Maybe when hovering the mouse over the list of pinned resources, a tooltip telling us the total amount of available storage we have for that resource - so we can build more if needed?
e.g. we can see easily we have 2k coal, but add a tooltip-style message that says we have 2.5k of storage capacity - so we might want to build more storage or move excavators to another resource we're not as well stocked with, before we hit the capacity limit. So overall, a resource management improvement.