diff --git a/lets-encrypt/README-CN.md b/lets-encrypt/README-CN.md
index 7cad213..1f2649e 100644
--- a/lets-encrypt/README-CN.md
+++ b/lets-encrypt/README-CN.md
@@ -47,7 +47,7 @@ DOMAINS="DNS:example.com,DNS:whatever.example.com"
 **在 nginx 里添加 ssl 相关的配置**
 
     ssl_certificate     /path/to/cert/example.chained.crt;
-    ssl_certificate_key /path/to/cert/example.key;
+    ssl_certificate_key /path/to/cert/example.com.key;
 
 **cron 定时任务**