diff --git a/dnsapi2.md b/dnsapi2.md
index 7bf865c..1377500 100644
--- a/dnsapi2.md
+++ b/dnsapi2.md
@@ -3217,6 +3217,7 @@ Export the required APPID and APPKEY:
 ```bash
 export GNAME_APPID="your APPID"
 export GNAME_APPKEY="your APPKEY"
+export GNAME_TTL="120" #DNS resolution record TTL value, default 120.
 
 acme.sh --issue --dns dns_gname -d example.com -d '*.example.com' --dnssleep 120
 ```