diff --git a/Main.hs b/Main.hs
index d0d1920..6aa895c 100644
--- a/Main.hs
+++ b/Main.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE RecordWildCards #-}
 
 module Main
@@ -12,23 +13,55 @@ import Licensor
 import Control.Monad
 import Data.List
 import Data.Monoid ((<>))
+import qualified Data.Version as Version
+import System.Environment
 import qualified System.Exit as Exit
 
 -- Cabal
 import Distribution.PackageDescription
 import Distribution.Text
 
+-- cmdargs
+import System.Console.CmdArgs
+
 -- containers
 import qualified Data.Map.Strict as Map
 import qualified Data.Set as Set
 
 
+-- |
+--
+--
+
+data LiArgs =
+  LiArgs
+    {
+    }
+  deriving (Data)
+
+
+-- |
+--
+--
+
+liArgs :: String -> Mode (CmdArgs LiArgs)
+liArgs s =
+  cmdArgsMode $
+    LiArgs
+      {
+      }
+  &= program s
+  &= summary (unwords ["licensor", Version.showVersion version])
+
+
 -- |
 --
 --
 
 main :: IO ()
 main = do
+  LiArgs <- cmdArgsRun . liArgs =<< getProgName
+
   maybePackage <- getPackage
 
   pid <-
diff --git a/licensor.cabal b/licensor.cabal
index 503d50b..75a3289 100644
--- a/licensor.cabal
+++ b/licensor.cabal
@@ -19,6 +19,8 @@ library
       src
   exposed-modules:
       Licensor
+  other-modules:
+      Paths_licensor
   build-depends:
       base >= 4.8 && < 5.0
     , Cabal >= 1.22 && < 1.25
@@ -37,6 +39,7 @@ executable licensor
   build-depends:
       base >= 4.8 && < 5.0
     , Cabal >= 1.22 && < 1.25
+    , cmdargs >= 0.10 && < 0.11
     , containers
     , licensor
   default-language:
diff --git a/src/Licensor.hs b/src/Licensor.hs
index 094d3c1..8bebf7d 100644
--- a/src/Licensor.hs
+++ b/src/Licensor.hs
@@ -8,11 +8,16 @@ module Licensor
   , getDependencies
   , getPackage
   , orderPackagesByLicense
+  , version
   )
   where
 
+-- licensor
+import qualified Paths_licensor as Paths
+
 -- base
 import Data.Monoid ((<>))
+import Data.Version (Version)
 import System.IO
 
 -- Cabal
@@ -151,3 +156,12 @@ orderPackagesByLicense p =
               orderedPackages
   in
     foldr insertPackage (pure mempty)
+
+
+-- |
+--
+--
+
+version :: Version
+version =
+  Paths.version