diff --git a/README.md b/README.md
index 834a91f..a634207 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,3 @@
 # Slides for parallel programming course
+
+[![License: CC BY 4.0](https://img.shields.io/badge/License-CC%20BY%204.0-lightgrey.svg)](https://creativecommons.org/licenses/by/4.0/)