Mouseover text on Dashboard - nit

A test user was confused about why only a few subnets were displayed on the dashboard, and wanted to know how/why some were picked for the display. It would be helpful to either change the title from "Subnets" to "Subnets - by pool utilization %" or something, or (maybe it would fit better and be less clutter in the UI) to add mouseover text that says, "Top 5 subnets ranked by % of pool utilization".