diff --git a/src/CircuitNotation.hs b/src/CircuitNotation.hs
index 65d2560..e9fc41f 100644
--- a/src/CircuitNotation.hs
+++ b/src/CircuitNotation.hs
@@ -36,6 +36,7 @@ module CircuitNotation
   , mkPlugin
   , thName
   , ExternalNames (..)
+  , Direction(..)
   ) where
 
 -- base