diff --git a/LICENSE.md b/LICENSE.md
new file mode 100644
index 000000000..5bfeea1e4
--- /dev/null
+++ b/LICENSE.md
@@ -0,0 +1 @@
+This book is licensed under the [CC-BY-NC-SA](https://creativecommons.org/licenses/by-nc-sa/4.0/) open-source license.