XMonad: set default workspace on startup to specific monitor

I'm using xmonad with a dual monitor setup. Here is a stripped down version of my config: import XMonad main = do xmonad $ defaultConfig { workspaces = ["1:db", "2:mail", "3:web", "4:dev", "5", "6", "7", "8:chat", "9", "10"] } Is there a way to configure it so that my left screen defaults to workspace 2:mail and right screen to workspace 3:web ?