diff --git a/pkgs/datalog/LICENSE.txt b/pkgs/datalog/LICENSE.txt
new file mode 100644
index 0000000..4533705
--- /dev/null
+++ b/pkgs/datalog/LICENSE.txt
@@ -0,0 +1,10 @@
+datalog
+Copyright (c) 2010-2013 PLT Design Inc.
+
+This package is distributed under the GNU Lesser General Public
+License (LGPL).  This means that you can link Racket into proprietary
+applications, provided you follow the rules stated in the LGPL.  You
+can also modify this package; if you distribute a modified version,
+you must distribute it under the terms of the LGPL, which in
+particular means that you must release the source code for the
+modified software.  See COPYING_LESSER.txt for more information.