Update README.md

README.md

 # substrate-tip-bot
 
-> A GitHub App built with [Probot](https://github.com/probot/probot) that A GitHub bot to submit tips on behalf of the network.
+> A GitHub App built with [Probot](https://github.com/probot/probot) that can submit tips on behalf
+> of a [Substrate](https://github.com/paritytech/substrate) based network.
 
 ## Setup
 
@@ -12,6 +13,25 @@ npm install
 npm start
 ```
 
+### ENV File
+
+To use this bot, you need to have a proper `.env` file created. Most of the options will
+automatically be generated by the GitHub application creation process, but you will also need to add
+`ACCOUNT_SEED` and `ALLOWED_USERS`:
+
+Example `.env` file:
+
+```
+WEBHOOK_PROXY_URL=https://smee.io/<secret>
+APP_ID=<id>
+PRIVATE_KEY="-----BEGIN RSA PRIVATE KEY-----\n  private key \n-----END RSA PRIVATE KEY-----\n"
+WEBHOOK_SECRET=<secret>
+GITHUB_CLIENT_ID=<id>
+GITHUB_CLIENT_SECRET=<secret>
+ACCOUNT_SEED="twelve words seperated by spaces which seeds the account controlled by bot"
+ALLOWED_USERS=["shawntabrizi", "and", "other", "github", "usernames", "in", "an", "array"]
+```
+
 ## Docker
 
 ```sh
@@ -24,10 +44,11 @@ docker run -e APP_ID=<app-id> -e PRIVATE_KEY=<pem-value> substrate-tip-bot
 
 ## Contributing
 
-If you have suggestions for how substrate-tip-bot could be improved, or want to report a bug, open an issue! We'd love all and any contributions.
+If you have suggestions for how substrate-tip-bot could be improved, or want to report a bug, open
+an issue! We'd love all and any contributions.
 
 For more, check out the [Contributing Guide](CONTRIBUTING.md).
 
 ## License
 
-[ISC](LICENSE) © 2021 Shawn Tabrizi <shawntabrizi@gmail.com>
+[MIT](LICENSE) © 2021 Shawn Tabrizi <shawntabrizi@gmail.com>