diff --git a/DNS-alias-mode.md b/DNS-alias-mode.md
index 17498c84..e6e91eea 100644
--- a/DNS-alias-mode.md
+++ b/DNS-alias-mode.md
@@ -1 +1,10 @@
-TODO:
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+Set domain CNAME:
+
+```sh
+_acme-challenge.example.com  =>   _acme-challenge.exampleAlias.com
+```
+
+
+```sh
+acme.sh  --issue  --issue  -d  example.com --challenge-alias exampleAlias.com --dns dns_cf
+```
\ No newline at end of file