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-rw-r--r--XMonad/Layout/Groups.hs4
1 files changed, 4 insertions, 0 deletions
diff --git a/XMonad/Layout/Groups.hs b/XMonad/Layout/Groups.hs
index 899ae62..4eaea40 100644
--- a/XMonad/Layout/Groups.hs
+++ b/XMonad/Layout/Groups.hs
@@ -352,6 +352,10 @@ refocus g = case getFocusZ $ gZipper $ W.focus $ groups g
--
-- * Duplicate layouts (only one will be kept, the rest will
-- get the base layout)
+--
+-- Note that 'ModifySpec' is a rank-2 type (indicating that 'ModifySpec's must be polymorphic
+-- in the layout type), so you'll need to add @{-# LANGUAGE Rank2Types #-}@ at the beginning
+-- of any module that defines functions taking 'ModifySpec's as arguments, or returning them.
type ModifySpec = forall l. WithID l Window
-> Zipper (Group l Window)
-> Zipper (Group l Window)