diff --git a/Docker-Mail-Server.md b/Docker-Mail-Server.md
index 600651c..3fa630a 100644
--- a/Docker-Mail-Server.md
+++ b/Docker-Mail-Server.md
@@ -11,5 +11,6 @@
 | TXT | @ | v=spf1 mx ~all |
 | TXT | _dmarc | v=DMARC1; p=quarantine; rua=mailto:dmarc.report@xxx.xx; ruf=mailto:dmarc.report@xxx.xx; fo=0; adkim=r; aspf=r; pct=100; rf=afrf; ri=86400; sp=quarantine |
 
-4. 服务器安装Docker和Docker Compose
-5. 
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+1. 服务器安装Docker和Docker Compose
+2. 申请证书，放到docker数据目录的ssl文件夹下
+3. 
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