diff --git a/README.md b/README.md
index fdf981f..96d7d0c 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,9 @@
 # Matrix4x5
 
 This is a library with sample code to use a 4x5 or 5x4 Matrix or keypad with an ATmega AVR controller.
+
+
+## LICENSE
+[LICENSE.md](LICENSE.md)
+
+Makefile comes from [mikrocontroller.net](https://www.mikrocontroller.net/articles/Beispiel_Makefile).