diff --git a/src/Mima/Word.hs b/src/Mima/Word.hs
index a3296b7..f3ab514 100644
--- a/src/Mima/Word.hs
+++ b/src/Mima/Word.hs
@@ -1,4 +1,8 @@
-module Mima.Word where
+module Mima.Word
+  ( Word32Based(..)
+  , MimaWord
+  , MimaAddress
+  ) where
 
 import           Data.Bits
 import           Data.Word