diff --git a/Control/Failure.hs b/Control/Failure.hs
--- a/Control/Failure.hs
+++ b/Control/Failure.hs
@@ -79,6 +79,8 @@
 
 data NothingException = NothingException
   deriving (Show, Typeable)
+instance Exception NothingException
+
 instance Try Maybe where
   type Error Maybe = NothingException
   try Nothing      = failure NothingException
@@ -91,6 +93,8 @@
 
 data NullException = NullException
   deriving (Show, Typeable)
+instance Exception NullException
+
 instance Try [] where
   type Error [] = NullException
   try []        = failure NullException
diff --git a/failure.cabal b/failure.cabal
--- a/failure.cabal
+++ b/failure.cabal
@@ -1,5 +1,5 @@
 name: failure
-version: 0.0.0
+version: 0.0.0.1
 Cabal-Version:  >= 1.6
 build-type: Simple
 license: PublicDomain