diff --git a/docs/clients-zh.md b/docs/clients-zh.md
index c1f5e1e..3bd9c75 100644
--- a/docs/clients-zh.md
+++ b/docs/clients-zh.md
@@ -545,6 +545,10 @@ touch /var/run/xl2tpd/l2tp-control
 
 ```bash
 service strongswan restart
+
+# 适用于 Ubuntu 20.04，如果 strongswan 服务不存在
+ipsec restart
+
 service xl2tpd restart
 ```
 
diff --git a/docs/clients.md b/docs/clients.md
index fa474c1..c1ec041 100644
--- a/docs/clients.md
+++ b/docs/clients.md
@@ -545,7 +545,7 @@ Restart services:
 ```bash
 service strongswan restart
 
-# For Ubuntu 20.04 if strongswan service not found
+# For Ubuntu 20.04, if strongswan service not found
 ipsec restart
 
 service xl2tpd restart