diff --git a/src/System/ZMQ.hs b/src/System/ZMQ.hs
--- a/src/System/ZMQ.hs
+++ b/src/System/ZMQ.hs
@@ -22,6 +22,8 @@
     Poll(..),
     PollEvent(..),
 
+    SType,
+    SubsType,
     Pair(..),
     Pub(..),
     Sub(..),
diff --git a/zeromq-haskell.cabal b/zeromq-haskell.cabal
--- a/zeromq-haskell.cabal
+++ b/zeromq-haskell.cabal
@@ -1,5 +1,5 @@
 name:               zeromq-haskell
-version:            0.3
+version:            0.3.1
 synopsis:           bindings to zeromq 
 description:        Bindings to zeromq (http://zeromq.org)
 category:           System, FFI