-This is Business::OnlinePayment::AuthorizeNet, an Authorize.Net-specific
-backend module for Business::OnlinePayment. It has been updated and now
-implements Authorize.Net API version 3.0.
+This is Business::OnlinePayment::AuthorizeNet, an Business::OnlinePayment
+backend module for Authorize.Net. It is only useful if you have a merchant
+account with Authorize.Net: http://www.authorize.net
+
+This module has been updated and now implements Authorize.Net API version 3.0.