diff --git a/README.md b/README.md
index c80111e..ab4174f 100644
--- a/README.md
+++ b/README.md
@@ -1,26 +1,38 @@
 Congressman by Location for AWS Lambda
 ========================================
-Simple lambda function for a microservice that finds your congressman by Lat, Lng coordinates or address. 
+Simple lambda function for a microservice that finds your members of Congress by Lat, Lng coordinates or address. 
 
 [![CircleCI](https://circleci.com/gh/chrisdevwords/congressman-by-location-lambda/tree/master.svg?style=shield)](https://circleci.com/gh/chrisdevwords/congressman-by-location-lambda/tree/master)
-[![Coverage Status](https://coveralls.io/repos/github/chrisdevwords/congressman-by-location-lambda/badge.svg?branch=master)](https://coveralls.io/github/chrisdevwords/congressman-by-location-lambda?branch=master)
+[![Coverage Status](https://coveralls.io/repos/github/chrisdevwords/congressman-by-location-lambda/badge.svg?branch=master&nocache=1)](https://coveralls.io/github/chrisdevwords/congressman-by-location-lambda?branch=master)
 [![Dependency Status](https://david-dm.org/chrisdevwords/congressman-by-location-lambda.svg)](https://david-dm.org/chrisdevwords/congressman-by-location-lambda)
 [![Dev Dependency Status](https://david-dm.org/chrisdevwords/congressman-by-location-lambda/dev-status.svg)](https://david-dm.org/chrisdevwords/congressman-by-location-lambda?type=dev)
 [![Known Vulnerabilities](https://snyk.io/test/github/chrisdevwords/congressman-by-location-lambda/badge.svg)](https://snyk.io/test/github/chrisdevwords/congressman-by-location-lambda)
 
 Uses [congressional-district-finder](https://github.com/chrisdevwords/congressional-district-finder) to find the district by latitude and longitude.
 
+Fetches names and basic information about members of Congress from the [ProPublica API](https://propublica.github.io/congress-api-docs/).
+
 Requirements
 ------------
 * Requires Node v4.3.2 
 * Package engine is set to strict to match [AWS Lambda Environment](https://aws.amazon.com/blogs/compute/node-js-4-3-2-runtime-now-available-on-lambda/)
 * I recommend using [NVM](https://github.com/creationix/nvm)
 
+### ProPublica API Key
+In order to run tests for the index handler in your local environment you will need to configure your own ProPublica API Key:
+- [Request an API Key](apihelp@propublica.org) from [ProPublica](https://propublica.github.io/congress-api-docs/).
+- Save this key (assuming the value is ABC123) to an .env file in the root of this repo:
+```
+$ echo PROPUBLICA_KEY=ABC123 > .env
+```
+You will also need to set the environmental key: "PROPUBLICA_KEY" to any AWS Lambda instances or CI tools that run the tests.
+
 ## Running Tests
-This project includes [Mocha](https://mochajs.org/) and [Chai](http://chaijs.com/) w/ [Chai-as-promised](https://www.npmjs.com/package/chai-as-promised) for testing service data parsing. If you add to this, write more tests. And run them:
+This project includes [Mocha](https://mochajs.org/) and [Chai](http://chaijs.com/). If you add to this, write more tests. And run them:
 ````
 $ npm test
 ````
+NOTE: Before running the tests, please read [how to configure your API Keys](#propublica-api-key)
 
 ### Contributing
 All code is transpiled from ES6 with Babel. The lint config is based on [AirBnB's eslint](https://www.npmjs.com/package/eslint-config-airbnb).