From 2e978607cb5a3e6f4033dc606f9cb3b00c122774 Mon Sep 17 00:00:00 2001
From: Go7hic <gtfx0209@qq.com>
Date: Mon, 6 Jul 2020 23:45:04 +0800
Subject: [PATCH] add ch4

---
 docs/_sidebar.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/docs/_sidebar.md b/docs/_sidebar.md
index 8676f41..2f08b47 100644
--- a/docs/_sidebar.md
+++ b/docs/_sidebar.md
@@ -4,4 +4,5 @@
 * [前言](./Preface.md)
 * [第一章：介绍](./ch1.md)
 * [第二章：复杂性的本质](./ch2.md)
-* [第三章：工作代码是不够的（战略与战术编程）](./ch3.md)
\ No newline at end of file
+* [第三章：工作代码是不够的（战略与战术编程）](./ch3.md)
+* [第四章：模块应该是深的](./ch3.md)
\ No newline at end of file