diff --git a/README.md b/README.md
index ec851e9..9d655f4 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,6 @@
 # Penning trap simulation
+
+## Credits
+
+The Doxygen theme used here is 
+[doxygen-awesome-css](https://github.com/jothepro/doxygen-awesome-css).