diff --git a/README.md b/README.md
index c9c0ba44..354e7908 100644
--- a/README.md
+++ b/README.md
@@ -37,3 +37,21 @@ Analysis (CASA), University College London and funded by Historic England.
 Ordnance Survey is providing building footprints required to collect the data,
 facilitated by the Greater London Authority (GLA), and giving access to its API
 and technical support.
+
+## License
+
+    Colouring London
+    Copyright (C) 2018 Tom Russell
+
+    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 3 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. If not, see <http://www.gnu.org/licenses/>.