diff --git a/.env_sample b/.env_sample
new file mode 100644
index 0000000..30857f4
--- /dev/null
+++ b/.env_sample
@@ -0,0 +1 @@
+export SENDGRID_API_KEY=''
\ No newline at end of file
diff --git a/README.md b/README.md
index 18ba291..d356deb 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,18 @@ All updates to this library is documented in our [CHANGELOG](https://github.com/
 
 - Ruby version 2.2+
 
+## Setup Environment Variables
+
+### Environment Variable
+
+Update the development environment with your [SENDGRID_API_KEY](https://app.sendgrid.com/settings/api_keys), for example:
+
+```bash
+echo "export SENDGRID_API_KEY='YOUR_API_KEY'" > sendgrid.env
+echo "sendgrid.env" >> .gitignore
+source ./sendgrid.env
+```
+
 ## Install Package
 
 ```bash
@@ -98,4 +110,4 @@ ruby-http-client is guided and supported by the SendGrid [Developer Experience T
 ruby-http-client is maintained and funded by SendGrid, Inc. The names and logos for ruby-http-client are trademarks of SendGrid, Inc.
 
 # License
-[The MIT License (MIT)](LICENSE.txt)
\ No newline at end of file
+[The MIT License (MIT)](LICENSE.txt)