diff --git a/chapters/11-analytics.md b/chapters/11-analytics.md
index 1d72dff..b92ca09 100644
--- a/chapters/11-analytics.md
+++ b/chapters/11-analytics.md
@@ -69,7 +69,7 @@ minuteswithcount = [(x, dataarray.count(x)) for x in set(dataarray)]
 
 ### Matplotlib
 
-开始之前需要安装``matplotlib
+开始之前需要安装`matplotlib`
 
 ```bash
 sudo pip install matplotlib