diff --git a/SUMMARY.md b/SUMMARY.md
index 6105000..7fe6625 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -59,6 +59,7 @@
     * [Per-CPU variables](Concepts/per-cpu.md)
     * [Cpumasks](Concepts/cpumask.md)
     * [The initcall mechanism](Concepts/initcall.md)
+    * [Notification Chains in Linux Kernel](Concepts/notification_chains.md)
 * [Data Structures in the Linux Kernel](DataStructures/README.md)
     * [Doubly linked list](DataStructures/dlist.md)
     * [Radix tree](DataStructures/radix-tree.md)