diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Sam Rijs
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
diff --git a/Setup.hs b/Setup.hs
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--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/hwsl2-reducers.cabal b/hwsl2-reducers.cabal
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--- /dev/null
+++ b/hwsl2-reducers.cabal
@@ -0,0 +1,29 @@
+-- Initial hwsl2-reducers.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                hwsl2-reducers
+version:             0.1.0.0
+synopsis:            Semigroup and Reducer instances for Data.Hash.SL2
+-- description:         
+homepage:            https://github.com/srijs/hwsl2-reducers
+license:             MIT
+license-file:        LICENSE
+author:              Sam Rijs
+maintainer:          srijs@airpost.net
+-- copyright:           
+category:            Data
+build-type:          Simple
+-- extra-source-files:  
+cabal-version:       >=1.10
+
+library
+  exposed-modules:     Data.Hash.SL2.Reducer
+  -- other-modules:       
+  -- other-extensions:    
+  build-depends:       base >=4.6 && <5.0,
+                       bytestring >=0.10,
+                       hwsl2 >=0.3,
+                       semigroups >=0.16,
+                       reducers >=3.10
+  hs-source-dirs:      src
+  default-language:    Haskell2010
diff --git a/src/Data/Hash/SL2/Reducer.hs b/src/Data/Hash/SL2/Reducer.hs
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--- /dev/null
+++ b/src/Data/Hash/SL2/Reducer.hs
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+{-# LANGUAGE MultiParamTypeClasses #-}
+
+module Data.Hash.SL2.Reducer where
+
+import Data.ByteString (ByteString)
+import Data.Hash.SL2
+import Data.Semigroup
+import Data.Semigroup.Reducer
+
+instance Semigroup Hash where
+  (<>) = mappend
+
+instance Reducer ByteString Hash where
+  unit = mempty
+  snoc = append
+  cons = prepend