diff --git a/nicify.cabal b/nicify.cabal
--- a/nicify.cabal
+++ b/nicify.cabal
@@ -1,5 +1,5 @@
 Name:           nicify
-Version:        1.0
+Version:        1.1
 Synopsis:       Pretty print the standard output of show for algebraic datatypes
 Description:    Pretty print the standard output of show for algebraic datatypes
                 
@@ -9,7 +9,7 @@
 Maintainer:     Julian Fleischer <julian.fleischer@fu-berlin.de>
 Build-Type:     Simple
 Cabal-Version:  >= 1.8
-Category:       Text, Tools
+Category:       Text, Tools, Utilities
 Stability:      stable
 
 Source-Repository head
diff --git a/src/nicify.hs b/src/nicify.hs
--- a/src/nicify.hs
+++ b/src/nicify.hs
@@ -1,3 +1,15 @@
 import Text.Nicify
+import System.Environment (getArgs)
 
-main = interact nicify
+main = do
+    args <- getArgs
+    main' args
+
+main' [] = interact nicify
+
+main' (x:[]) = do
+    contents <- readFile x
+    putStr (nicify contents)
+
+main' (x:xs) = main' [x] >> main' xs
+