diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2016 Tom Sydney Kerckhove
+
+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/src/Data/Validity/Containers.hs b/src/Data/Validity/Containers.hs
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--- /dev/null
+++ b/src/Data/Validity/Containers.hs
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+module Data.Validity.Containers where
+
+import Data.Validity.Tree as Containers ()
+
+
diff --git a/src/Data/Validity/Map.hs b/src/Data/Validity/Map.hs
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--- /dev/null
+++ b/src/Data/Validity/Map.hs
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+module Data.Validity.Map where
+
+import           Data.Validity
+
+import           Data.Map (Map)
+import qualified Data.Map as M
+
+-- | A tree of things is valid if all the things are valid
+instance (Validity k, Validity v) => Validity (Map k v) where
+    isValid m = all isValid (M.keys m) && all isValid m
+
+
diff --git a/src/Data/Validity/Tree.hs b/src/Data/Validity/Tree.hs
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--- /dev/null
+++ b/src/Data/Validity/Tree.hs
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+module Data.Validity.Tree where
+
+import           Data.Validity
+
+import           Data.Tree
+
+-- | A tree of things is valid if all the things are valid
+instance Validity a => Validity (Tree a) where
+    isValid = all isValid
+
+
diff --git a/validity-containers.cabal b/validity-containers.cabal
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--- /dev/null
+++ b/validity-containers.cabal
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+name:                validity-containers
+version:             0.1.0.0
+synopsis:            Validity instances for containers
+description:         Please see README.md
+homepage:            https://github.com/NorfairKing/validity#readme
+license:             MIT
+license-file:        LICENSE
+author:              Tom Sydney Kerckhove
+maintainer:          syd.kerckhove@gmail.com
+copyright:           Copyright: (c) 2016 Tom Sydney Kerckhove
+category:            Web
+build-type:          Simple
+-- extra-source-files:
+cabal-version:       >=1.10
+
+library
+  hs-source-dirs:      src
+  exposed-modules:     Data.Validity.Containers
+                     , Data.Validity.Tree
+                     , Data.Validity.Map
+  build-depends:       base >= 4.7 && < 5
+                     , validity
+                     , containers 
+  default-language:    Haskell2010
+
+source-repository head
+  type:     git
+  location: https://github.com/NorfairKing/validity