diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,27 @@
+Copyright (c) Edward Z. Yang 2017
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. Neither the name of the author nor the names of his contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.
diff --git a/groom.cabal b/groom.cabal
--- a/groom.cabal
+++ b/groom.cabal
@@ -1,5 +1,5 @@
 Name:               groom
-Version:            0.1.2
+Version:            0.1.2.1
 Synopsis:           Pretty printing for well-behaved Show
                     instances.
 Description:        Automatically derived Show instances are an easy way
@@ -24,14 +24,20 @@
                     Groom works only on Show instances that output valid
                     Haskell code; if Groom can't understand its input,
                     it will not make any changes.
-License:            PublicDomain
+License:            BSD3
+License-File:       LICENSE
 Author:             Edward Z. Yang
 Maintainer:         ezyang@mit.edu
 Category:           Text
 Build-type:         Simple
-Cabal-version:      >=1.2
+Cabal-version:      >=1.8
 
 Library
   Exposed-modules:      Text.Groom
   Build-depends:        haskell-src-exts >= 1.0.0,
                         base >= 3 && < 5
+
+executable groom
+  main-is: Main.hs
+  hs-source-dirs: main
+  build-depends: groom, base
diff --git a/main/Main.hs b/main/Main.hs
new file mode 100644
--- /dev/null
+++ b/main/Main.hs
@@ -0,0 +1,2 @@
+import Text.Groom
+main = getContents >>= putStrLn . groomString