diff --git a/Invisible.hs b/Invisible.hs
index 110128d6..5ee9c256 100644
--- a/Invisible.hs
+++ b/Invisible.hs
@@ -26,7 +26,7 @@ module XMonadContrib.Invisible (
 -- A wrapper data type to store layout state that shouldn't be persisted across
 -- restarts. A common wrapped type to use is @Maybe a@.
 -- Invisible derives trivial definitions for Read and Show, so the wrapped data
--- type need not do so
+-- type need not do so.
 
 newtype Invisible m a = I (m a) deriving (Monad, Functor)