diff --git a/docs/README.md b/docs/README.md
index 2a79fd7..e916933 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -54,7 +54,7 @@ $account->deactivateAccount();                 // Deactive the account
 These methods bellow are mainly used for generating certificates.
 
 ```php
-/* Domains and challenges info */
+/* Domains and challenges info for a single certificate with multiple SAN: abc.example.com, *.www.example.com and www.example.com */
 $domainInfo = [
     CommonConstant::CHALLENGE_TYPE_HTTP => [
         'abc.example.com'
@@ -162,4 +162,4 @@ This Project had got a lot of inspirations from [yourivw/LEClient](https://githu
 
 
 ## 8. License
-This project is licensed under the MIT License, see the [LICENSE](https://github.com/stonemax/acme2/blob/develop/LICENSE) file for detail.
\ No newline at end of file
+This project is licensed under the MIT License, see the [LICENSE](https://github.com/stonemax/acme2/blob/develop/LICENSE) file for detail.