README.md in ndr_stats-0.2.1 vs README.md in ndr_stats-0.2.2

@@ -1,6 +1,6 @@
-# NdrStats [![Build Status](https://travis-ci.org/PublicHealthEngland/ndr_stats.svg?branch=master)](https://travis-ci.org/PublicHealthEngland/ndr_stats)
+# NdrStats [![Build Status](https://github.com/NHSDigital/ndr_stats/workflows/Test/badge.svg)](https://github.com/NHSDigital/ndr_stats/actions?query=workflow%3Atest) [![Gem Version](https://badge.fury.io/rb/ndr_stats.svg)](https://badge.fury.io/rb/ndr_stats)
 
 Provides pain-free setup of stats collecting to Ruby/Rails projects.
 
 ## Assumed Architecture
 
@@ -30,19 +30,31 @@
 NdrStats.configure(host: 'localhost', port: 9125)
 ```
 
 ### Rails
 
-When used in a Rails application, you can store configuration in `config/stats.yml`.
+When used in a Rails application, you have the option to auto-configure `NdrStats`.
 
+#### File-based
+
+Add configuration in `config/stats.yml`:
+
 ```yaml
 ---
 host: localhost
 port: 9125
 ```
 
+#### Environment config
+
+Alternatively, you can use environment variables `NDR_STATS_{HOST,PORT,SYSTEM,STACK}` to provide config parameters.
+Environment variables override any file-based configuration that's also found.
+
+#### System / Stack
+
 It's additionally possible to specify `system` and `stack`, which will be automatically added as tags on all stats.
 If the host application's enclosing module responds to the `flavour` or `stack` methods, these will be used if not otherwise specified.
+
 
 ## Usage
 
 Basic usage is as follows: