[docs] Added instructions for license.pem (#3504)

* Added instructions for license.pem
Co-authored-by: Ben Arent <ben@gravitational.com>

examples/aws/cloudformation/README.md

@@ -7,7 +7,13 @@
 We provide these CloudFormation templates as an example of how to setup HA Teleport in
 AWS using our AMIs. The current template will create a Highly available Teleport setup
 using DynamoDB and S3 to store logs. This setup will acquire a Let's Encrypt x509 certificate
-for you. 
+for you.
+
+If you are using the enterprise template please ensure that you have an enterprise license
+available. If you are an enterprise customer you can find the license in your dashboard 
+at https://dashboard.gravitational.com/web/ . Once the CloudFormation stack is complete 
+you will need to place your enterprise license file onto each Auth server in   
+`/var/lib/teleport/license.pem`.
 
 ## Launch VPC
 In this example Teleport requires a VPC to install into.
@@ -59,4 +65,4 @@ Once uploaded CloudFormation will ask for a bunch of parameters to configure Tel
 ![Adding Setting](./img/aws-cf-oss-teleport.png)
 
 The setup might take up to 20 minutes as it'll have to request a x509 certificate
-from Let's Encrypt to setup your cluster. 
+from Let's Encrypt to setup your cluster.