diff --git a/README.md b/README.md
index b35493c..59a115f 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,7 @@ sudo rmmod [module_name].ko
 
 - https://www.kernel.org/doc/html/latest/
 - https://elixir.bootlin.com/linux/v6.13/source/
+- https://static.lwn.net/images/pdf/LDD3/ch01.pdf
 
 ## Notes