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/Text.hs b/src/Data/Validity/Text.hs
new file mode 100644
--- /dev/null
+++ b/src/Data/Validity/Text.hs
@@ -0,0 +1,19 @@
+module Data.Validity.Text where
+
+import           Data.Validity
+
+import           Data.Text.Internal (Text(..))
+import qualified Data.Text.Array as A
+
+-- | A text is valid if the internal structure is consistent.
+instance Validity Text where
+    isValid (Text arr off len) =
+        let c    = A.unsafeIndex arr off
+        in    (len >= 0)
+           && (off >= 0)
+           -- TODO(syd) also check the length of the byte array if that is
+           -- possible. Like this:
+           -- && (alen == 0 || len == 0 || off < alen)
+           && (len == 0 || c < 0xDC00 || c > 0xDFFF)
+
+
diff --git a/validity-text.cabal b/validity-text.cabal
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--- /dev/null
+++ b/validity-text.cabal
@@ -0,0 +1,26 @@
+name:                validity-text
+version:             0.1.0.0
+synopsis:            Validity instances for text
+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.Text
+  build-depends:       base < 5
+                     , validity
+                     , text
+  default-language:    Haskell2010
+
+source-repository head
+  type:     git
+  location: https://github.com/NorfairKing/validity