diff --git a/README b/README
index e82fd5870a..315cd247bd 100644
--- a/README
+++ b/README
@@ -83,6 +83,7 @@ description: some description so someone else can know what this is
 
 
 4. setup a host playbook ansible/playbooks/hosts/$YOUR_HOSTNAME_HERE.yml
+   Note: The filename must be the Hostname, not IP address.
 - name: check/create instance
   hosts: $YOUR_HOSTNAME/IP HERE
   user: root