diff --git a/src/Data/Unamb.hs b/src/Data/Unamb.hs
--- a/src/Data/Unamb.hs
+++ b/src/Data/Unamb.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE PatternSignatures #-}
+{-# LANGUAGE ScopedTypeVariables #-}
 {-# OPTIONS_GHC -Wall #-}
 ----------------------------------------------------------------------
 -- |
@@ -43,14 +43,13 @@
 -- whichever finishes first.  See also 'amb'.  Thanks to Spencer Janssen
 -- for this simple version.
 race :: IO a -> IO a -> IO a
-race a b = do
-    v <- newEmptyMVar
-    ta <- forkIO (a >>= putMVar v)
-    tb <- forkIO (b >>= putMVar v)
-    x <- takeMVar v
-    -- TODO: why forkIO in the next line?
-    forkIO (killThread ta >> killThread tb)
-    return x
+a `race` b = do v  <- newEmptyMVar
+                ta <- forkIO (a >>= putMVar v)
+                tb <- forkIO (b >>= putMVar v)
+                x  <- takeMVar v
+                killThread ta
+                killThread tb
+                return x
 
 -- Without using unsafePerformIO, is there a way to define a
 -- non-terminating but non-erroring pure value that consume very little
diff --git a/tests/Tests.hs b/tests/Tests.hs
--- a/tests/Tests.hs
+++ b/tests/Tests.hs
@@ -35,8 +35,11 @@
    unambt :: NumT -> NumT -> NumT
    unambt = unamb
 
--- The commutative and associative test take a long time because of the
--- intentional delays.  I don't understand the magnitude of the delays,
--- however.  They appear to be 1000 times what I'd expect.  For instance,
--- 0.00001 sec time 500 tests is 5 milliseconds, but I count about 10
--- seconds.
+-- On Windows the commutative and associative test take a long time
+-- because of the intentional delays.  I don't understand the magnitude of
+-- the delays, however.  They appear to be 1000 times what I'd expect.
+-- For instance, 0.00001 sec time 500 tests is 5 milliseconds, but I count
+-- about 10 seconds.
+-- 
+-- On Linux, everything is zippy.
+
diff --git a/unamb.cabal b/unamb.cabal
--- a/unamb.cabal
+++ b/unamb.cabal
@@ -1,5 +1,5 @@
 Name:                unamb
-Version:             0.0
+Version:             0.0.1
 Cabal-Version:       >= 1.2
 Synopsis:            Unambiguous choice
 Category:            Concurrency, Data, Other
@@ -15,6 +15,8 @@
   to wiki pages where you can read and contribute user comments.  Enjoy!
   .
   &#169; 2008 by Conal Elliott; BSD3 license.
+  .
+  Contributions from: Luke Palmer, Spencer Janssen
 Author:              Conal Elliott 
 Maintainer:          conal@conal.net
 Homepage:            http://haskell.org/haskellwiki/unamb