diff --git a/src/PGF.hs b/src/PGF.hs
index 45da170d9..599b6b47a 100644
--- a/src/PGF.hs
+++ b/src/PGF.hs
@@ -23,7 +23,7 @@ module PGF(
            languages, abstractName, languageCode,
            
            -- * Types
-           Type(..),
+           Type(..), Hypo(..),
            showType, readType,
            categories, startCat,