diff --git a/dnsapi.md b/dnsapi.md
index 6ac4188..fa3558e 100644
--- a/dnsapi.md
+++ b/dnsapi.md
@@ -2489,9 +2489,9 @@ Export your credentials as an environment variable:
 About "DomainName" parameters see: https://support.huaweicloud.com/api-iam/iam_01_0006.html
 
 ```sh
-export HUAWEICLOUD_Username=<Your Username> # Usually hwxxxxxx
+export HUAWEICLOUD_Username=<Your Username> # IAM Username
 export HUAWEICLOUD_Password=<Your Password>
-export HUAWEICLOUD_DomainName=<Your DomainName> 
+export HUAWEICLOUD_DomainName=<Your DomainName>
 ```
 
 To issue a cert: