diff --git a/dnsapi2.md b/dnsapi2.md
index 605e96f..94d6b0d 100644
--- a/dnsapi2.md
+++ b/dnsapi2.md
@@ -3160,7 +3160,12 @@ To issue a cert:
 export Baidu_AK="your-access-key-id"
 export Baidu_SK="your-secret-access-key"
 
-./acme.sh --issue --dns dns_baidu -d example.com -d '*.example.com'
+# 1. Usage for Let's Encrypt
+acme.sh --server letsencrypt --issue --dns dns_baidu -d example.com -d '*.example.com'
+
+# 2. Usage for ZeroSSL
+acme.sh --register-account -m my@example.com # do once before issue
+acme.sh --issue --dns dns_baidu -d example.com -d '*.example.com'
 ```
 
 The `Baidu_AK` and `Baidu_SK` will be saved in `~/.acme.sh/account.conf` and reused for automatic renewal.
@@ -3169,10 +3174,10 @@ Optional settings:
 
 ```sh
 export Baidu_BCD_Host="bcd.baidubce.com"
-export Baidu_BCD_Version="1"
+export Baidu_BCD_Version=1
 export Baidu_BCD_Expire=3600
 export Baidu_View="DEFAULT"
-export Baidu_TTL="600"
+export Baidu_TTL=300
 export Baidu_RM_Max Max=20
 ```