diff --git a/kernel-rs/README.md b/kernel-rs/README.md
index 342e5999..fe70ace6 100644
--- a/kernel-rs/README.md
+++ b/kernel-rs/README.md
@@ -1,3 +1,5 @@
+based on [Writing an OS in rust](https://os.phil-opp.com/)
+
 # compiling
 
 a standard development environment can be invoked: