diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 9f9ae7c5..5bd9b961 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -83,7 +83,7 @@ We welcome direct contributions to the sendgrid-ruby code base. Thank you!
    bundle install
    ```
 
-## Environment Variables
+### Environment Variables
 
 First, get your free SendGrid account [here](https://sendgrid.com/free?source=sendgrid-ruby).