diff --git a/readme.md b/readme.md
index 7584edd..2c4e522 100644
--- a/readme.md
+++ b/readme.md
@@ -227,7 +227,9 @@ Now, NameSilo-DDNS supports docker on Linux, no need to have a python environmen
 
 <b>Pull from Docker Hub</b>
 
-> docker pull charles94jp/ddns
+```shell
+docker pull charles94jp/ddns
+```
 
 This image is built based on the smallest Linux alpine image, Docker Hub shows 21.37M, `docker images` shows the image size is 57M.
 
diff --git a/readme.zh-CN.md b/readme.zh-CN.md
index 2672165..b4a35b2 100644
--- a/readme.zh-CN.md
+++ b/readme.zh-CN.md
@@ -240,7 +240,9 @@ systemctl enable DDNS
 
 <b>Pull from Docker Hub</b>
 
->  docker pull charles94jp/ddns
+```shell
+docker pull charles94jp/ddns
+```
 
 本镜像基于最小的Linux alpine构建,Docker Hub显示21.37M,`docker images`显示镜像大小为57M