diff --git a/DNS-alias-mode.md b/DNS-alias-mode.md
index 2e82b8d..3ff3258 100644
--- a/DNS-alias-mode.md
+++ b/DNS-alias-mode.md
@@ -6,6 +6,6 @@ _acme-challenge.example.com  =>   _acme-challenge.exampleAlias.com
 
 
 ```sh
-acme.sh  --issue  --issue  \
+acme.sh --issue  \
   -d  example.com --challenge-alias exampleAlias.com --dns dns_cf
 ```
\ No newline at end of file