diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..46351b5
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,15 @@
+Copyright © 2019, 2020 William Brawner.
+
+PiHelper 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.
+
+PiHelper 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 PiHelper.  If not, see <https://www.gnu.org/licenses/>.
+