mention web form cannot be used for delegated domain.

README.md

@@ -10,6 +10,6 @@ The default top domain is *stanford.edu*.
 
 **Note:** the subdomain key and the csr will be saved in your current working directory. 
 
-If the subdomain is delegated to a cloud vendor, you will need to send the csr to its-ssl-service@lists.stanford.edu.
-Otherwise you can use [cert request form](https://tools.stanford.edu/cgi-bin/cert-request) to submit 
-your request. 
+Normally you can use [cert request form](https://tools.stanford.edu/cgi-bin/cert-request) to submit 
+your request, however, if the subdomain is delegated to a cloud vendor, you will need to send the csr to 
+its-ssl-service@lists.stanford.edu because the form cannot verify the ownership of a delegated domain from NetDB.