Further updating readme

README.md

@@ -9,7 +9,7 @@ In conjunction with the [ansible-playbooks](https://github.internet2.edu/docker/
 
 The templates are only tested with [packer](http://www.packer.io/downloads.html) 0.10.1 and later.  If you have homebrew installed, `brew install packer` is effective.
 
-For local builds, you will need to provide a symbolic link to the `ansible-playbooks` directory for matching repo location. Make sure you have cloned and setup the [ansible-playbooks repo](https://github.internet2.edu/docker/ansible-playbooks).
+For local builds, you will need to provide a symbolic link to the `ansible-playbooks` directory for matching repo location. Make sure you have cloned and setup the [ansible-playbooks repo](https://github.internet2.edu/docker/ansible-playbooks).  The `master` branch is acceptable for all developer test builds.
 
 #### example
 ```