diff --git a/lib/generators/vulcanize/templates/passenger/config/rubber/role/passenger/passenger-apache-vhost.conf b/lib/generators/vulcanize/templates/passenger/config/rubber/role/passenger/passenger-apache-vhost.conf
index 97f0f3ac5..f60f98c55 100644
--- a/lib/generators/vulcanize/templates/passenger/config/rubber/role/passenger/passenger-apache-vhost.conf
+++ b/lib/generators/vulcanize/templates/passenger/config/rubber/role/passenger/passenger-apache-vhost.conf
@@ -44,4 +44,5 @@ Listen <%= port %>
 
 <% end %>
 
+# The host here needs to match ServerName.
 PassengerPreStart http://<%= rubber_env.domain %>:<%= rubber_env.passenger_listen_port %>/