README.md in kitchen-ec2-1.4.0 vs README.md in kitchen-ec2-2.0.0

@@ -147,38 +147,21 @@
 We always pick the highest released stable version that matches your regex, and
 follow the other `image_search` rules for preference.
 
 ### AWS Authentication
 
-In order to connect to AWS, you must specify the AWS access key id and secret key
-for your account. There are 3 ways you do this, and we will try them in the
-following order:
+In order to connect to AWS, you must specify AWS credentials. We rely on the SDK
+to find credentials in the standard way, documented here: 
+https://github.com/aws/aws-sdk-ruby/#configuration
 
-1. You can specify the access key and access secret (and optionally the session
-   token) through config.  See the `aws_access_key_id` and `aws_secret_access_key`
-   config sections below to see how to specify these in your .kitchen.yml or
-   through environment variables.  If you would like to specify your session token
-   use the environment variable `AWS_SESSION_TOKEN`.
-2. The shared credentials ini file at `~/.aws/credentials`. This is the file
-   populated by `aws configure` command line and used by AWS tools in general, so if
-   you are set up for any other AWS tools, you probably already have this. You can
-   specify multiple profiles in this file and select one with the `AWS_PROFILE`
-   environment variable or the `shared_credentials_profile` driver config.  Read
-   [this][credentials_docs] for more information.
-3. From an instance profile when running on EC2.  This accesses the local
-   metadata service to discover the local instance's IAM instance profile.
+The SDK Chain will search environment variables, then config files, then IAM role
+data from the instance profile, in that order. In the case config files being 
+present, the 'default' profile will be used unless `shared_credentials_profile` 
+is defined to point to another profile. 
 
-This precedence order is taken from http://docs.aws.amazon.com/sdkforruby/api/index.html#Configuration
-
-The first method attempted that works will be used.  IE, if you want to auth
-using the instance profile, you must not set any of the access key configs
-or environment variables, and you must not specify a `~/.aws/credentials`
-file.
-
 Because the Test Kitchen test should be checked into source control and ran
 through CI we no longer recommend storing the AWS credentials in the
-`.kitchen.yml` file.  Instead, specify them as environment variables or in the
-`~/.aws/credentials` file.
+`.kitchen.yml` file.
 
 ### Instance Login Configuration
 
 The instances you create use credentials you specify which are *separate* from
 the AWS credentials. Generally, SSH and WinRM use an AWS key pair which you