diff --git a/README.md b/README.md
index e5c4b9f..5d2dec9 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,12 @@
 # OddJob #
 
-A simple tool for tracking time
+A simple tool for tracking time.
 
-OddJob stores its data in a text file called '.oddjob', 1 line per entry. 
+Like many unix admins, I always have terminals open. Other time tracking tools carry a lot of overhead, and I only wanted to quickly estimate how much time the unexpected non-project time takes. OddJob should allow me to log these without too much overhead. 
+
+OddJob stores its data in a text file called .oddjob, kept in your home directory, 1 line per entry. 
+
+OddJob requires perl5, but should work with any reasonably current version. It doesn't need any unusual modules. Works fine on Linux, Solaris and OS X. Not tested on Windows.
 
 ## Usage ##
 
@@ -42,3 +46,8 @@ You can also search by passing any other text:
 ## TODO ##
 
 Summary/stats scripts.
+
+## License ##
+
+OddJob is released under the GPLv2 license. See the COPYING file for
+details.
diff --git a/oj b/oj
index bf537e0..be40a7c 100755
--- a/oj
+++ b/oj
@@ -1,6 +1,22 @@
 #!/usr/bin/perl
 
-# OddJob - a simple tool for tracking time
+# OddJob: a simple tool for tracking time
+# Copyright (C) 2011  Ben Charlton <ben@spod.cx>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; see the file COPYING. If not, write to the Free 
+# Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
+# MA 02110-1301 USA, or see http://www.gnu.org
 
 use strict;