From 52691aeb86f9431f41115fd6144a1cc47a16fafd Mon Sep 17 00:00:00 2001
From: 0xAX <0xAX@users.noreply.github.com>
Date: Sun, 8 May 2016 20:15:06 +0600
Subject: [PATCH] Update SUMMARY.md

---
 SUMMARY.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/SUMMARY.md b/SUMMARY.md
index 305fe1a..4bd6a11 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -45,6 +45,7 @@
     * [Introduction to spinlocks](SyncPrim/sync-1.md)
     * [Queued spinlocks](SyncPrim/sync-2.md)
     * [Semaphores](SyncPrim/sync-3.md)
+    * [Mutex](SyncPrim/sync-4.md)
 * [Memory management](mm/README.md)
     * [Memblock](mm/linux-mm-1.md)
     * [Fixmaps and ioremap](mm/linux-mm-2.md)