README.md in ami_spec-1.4.0 vs README.md in ami_spec-1.5.0

@@ -1,7 +1,11 @@
 # AmiSpec
 
+[![License MIT](https://img.shields.io/badge/license-MIT-brightgreen.svg)](https://github.com/envato/ami-spec/blob/master/LICENSE.txt)
+[![Gem Version](https://badge.fury.io/rb/ami_spec.svg)](https://badge.fury.io/rb/ami_spec)
+[![Build Status](https://travis-ci.org/envato/ami-spec.svg?branch=master)](https://travis-ci.org/envato/ami-spec)
+
 Acceptance testing your AMIs.
 
 AmiSpec is a RubyGem used to launch an Amazon Machine Image (AMI) and run ServerSpecs against it. It wraps around the AWS API and ServerSpec to spin up, test and tear down instances.
 
 ## Project Goals
@@ -33,10 +37,11 @@
                                         folder
   -a, --ami=<s>                         The ami ID to run tests against
   -o, --role-ami-file=<s>               A file containing comma separated roles and amis. i.e.
                                         web_server,ami-id.
   -s, --specs=<s>                       The directory to find ServerSpecs
-  -u, --subnet-id=<s>                   The subnet to start the instance in
+  -u, --subnet-id=<s>                   The subnet to start the instance in. If not provided a subnet
+                                        will be chosen from the default VPC
   -k, --key-name=<s>                    The SSH key name to assign to instances. If not provided a
                                         temporary key pair will be generated in AWS
   -e, --key-file=<s>                    The SSH private key file associated to the key_name
   -h, --ssh-user=<s>                    The user to ssh to the instance as
   -w, --aws-region=<s>                  The AWS region, defaults to AWS_DEFAULT_REGION environment