diff --git a/Docker-Mail-Server.md b/Docker-Mail-Server.md
index af8baae..931dee7 100644
--- a/Docker-Mail-Server.md
+++ b/Docker-Mail-Server.md
@@ -97,4 +97,11 @@ docker-compose up -d `# 启动容器`
 docker-compose logs -f `# 观察容器 相关日志`
 ./setup.sh email add xx@xxx.xx "xxx" `# 添加 邮件账号及密码`
 ./setup.sh email update xx@xxx.xx  "xxx" `# 更新 邮件账号及密码`
+```
+
+# 四、生成并解析dkim记录
+```
+./setup.sh config dkim
+
+cat /tmp/docker-mailserver/opendkim/keys/xxx.xx/mail.private
 ```
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