diff --git a/src/Path/Internal.hs b/src/Path/Internal.hs
index 1cc47e1..9cc880e 100644
--- a/src/Path/Internal.hs
+++ b/src/Path/Internal.hs
@@ -1,5 +1,9 @@
 {-# LANGUAGE DeriveDataTypeable #-}
 
+-- TODO: - remove undefined in Ord instance
+--       - use viewpatterns/patternsynonyms so we don't need to
+--         export the constructors
+
 -- | Internal types and functions.
 
 module Path.Internal