Small fixes to README

README.md

@@ -7,16 +7,16 @@ a Docker image) which contains utilities to manage your cluster.
 
 ## Prerequisites
 
-* You need to have ssh access to the root account of the machines that will run
-your cluster.
+* You need to have ssh access (either as root, or a another user that can
+  `sudo`) to the machines that will make up your cluster.
 * You need ansible installed on your workstation to run the bootstrap scripts.
 
 ## Bootstrapping a new cluster
 
 ### Configure your cluster
 
-Copy `ansible/inventory.example` to `ansible/inventory` and edit it to reflect
-your cluster.
+Copy `ansible/inventory.yml.example` to `ansible/inventory.yml` and edit it to
+reflect your cluster.
 
 Also copy `ansible/group_vars/cluster/settings.yml.example` to
 `ansible/group_vars/cluster/settings.yml` and edit as you see fit.