diff --git a/README.md b/README.md
index 372497d..1d9ac20 100644
--- a/README.md
+++ b/README.md
@@ -52,6 +52,7 @@ Thank you to [all the people](https://github.com/ryan4yin/nixos-and-flakes-book/
 ## References
 
 - The cover is based on the image from anime "[The Rolling Girls](https://en.m.wikipedia.org/wiki/The_Rolling_Girls)"
+- The NixOS logo is from [NixOS](https://nixos.org/)
 
 ## License