From 02cc20f21d6b3a9515a6e0bf2ae5fc0b81249280 Mon Sep 17 00:00:00 2001
From: David Young <46375780+yyysjz1997@users.noreply.github.com>
Date: Thu, 10 Sep 2020 16:42:40 +0800
Subject: [PATCH] Update _sidebar.md

---
 docs/_sidebar.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docs/_sidebar.md b/docs/_sidebar.md
index b7f59f1..7f41dbe 100755
--- a/docs/_sidebar.md
+++ b/docs/_sidebar.md
@@ -17,6 +17,7 @@
 - [第八章 Q 学习 (连续动作)](chapter8/chapter8)
 - [第八章习题](chapter8/chapter8_questions&keywords)
 - [第九章 演员-评论员算法](chapter9/chapter9)
+- [第九章习题](chapter9/chapter9_questions&keywords)
 - [第十章 稀疏奖励](chapter10/chapter10)
 - [第十一章 模仿学习](chapter11/chapter11)
 - [第十二章 深度确定性策略梯度 (DDPG) 算法](chapter12/chapter12)