diff --git a/codex.cabal b/codex.cabal
--- a/codex.cabal
+++ b/codex.cabal
@@ -1,12 +1,14 @@
 name:                codex
-version:             0.0.1.3
-synopsis:            Code Explorer for Cabal
+version:             0.0.1.4
+synopsis:            A ctags file generator for cabal project dependencies.
 description:         
   This tool download and cache the source code of packages in your local hackage,
   he can then use this cache to generate `tags` files aggregating the sources of all the dependencies of your cabal projects.
   . 
   You basically do `codex update` in your cabal project directory and you'll get a `codex.tags` file
   that you can use in your favorite text editor.
+  .
+  Usage overview can be found in the <http://github.com/aloiscochard/codex#codex README>.
 
 homepage:            http://github.com/aloiscochard/codex
 license:             OtherLicense
diff --git a/src/Main.hs b/src/Main.hs
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -17,6 +17,7 @@
 import System.Directory
 import System.Environment
 import System.FilePath
+import System.Exit
 
 import qualified Data.List as List
 
@@ -59,7 +60,6 @@
   resolve Nothing = putStrLn "No cabal file found."
   resolve (Just project) = do
     dependencies <- fmap (\db -> resolveDependencies db project) readHackage
-    traverse (putStrLn . show . identifier) dependencies
     shouldUpdate <- runEitherT . isUpdateRequired tagsFile $ fmap identifier dependencies
     when (either (const True) id shouldUpdate || force) $ do
       fileExist <- doesFileExist tagsFile
@@ -77,6 +77,17 @@
           res <- runEitherT $ assembly cx (fmap identifier xs) tagsFile
           either (putStrLn . show) (const $ return ()) res
 
+help :: IO ()
+help = putStrLn $
+  unlines [ "Usage: codex [update] [cache clean] [set tagger [hasktags|ctags]]"
+          , "             [--help]"
+          , ""
+          , " update                Synchronize the `codex.tags` file in the current cabal project directory"
+          , " cache clean           Remove all `tags` file from the local hackage cache]"
+          , " set tagger <tagger>   Update the `~/.codex` configuration file for the given tagger (hasktags|ctags)."
+          , ""
+          , "By default `hasktags` will be used, and need to be in the `PATH`, the tagger command can be fully customized in `~/.codex`." ]
+
 main :: IO ()
 main = do
   cx    <- loadConfig
@@ -87,7 +98,11 @@
     run cx ["update", "--force"]  = update cx True
     run cx ["set", "tagger", "ctags"]     = encodeConfig $ cx { tagsCmd = taggerCmd Ctags }
     run cx ["set", "tagger", "hasktags"]  = encodeConfig $ cx { tagsCmd = taggerCmd Hasktags }
-    run cx _          = putStrLn "Usage: codex [update|cache clean|set tagger [ctags|hasktags]]"
+    run cx ["--help"] = help
+    run cx []         = help
+    run cx (x:_)      = do
+      putStrLn $ concat ["codex: '", x,"' is not a codex command. See 'codex --help'."]
+      exitWith (ExitFailure 1)
 
 loadConfig :: IO Codex
 loadConfig = decodeConfig >>= maybe defaultConfig return where