diff --git a/Concepts/README.md b/Concepts/README.md
index 23bec8c..8ff2c3a 100644
--- a/Concepts/README.md
+++ b/Concepts/README.md
@@ -3,3 +3,4 @@
 This chapter describes various concepts which are used in the Linux kernel.
 
 * [Per-CPU variables](http://0xax.gitbooks.io/linux-insides/content/Concepts/per-cpu.html)
+* [CPU masks](http://0xax.gitbooks.io/linux-insides/content/Concepts/cpumask.html)