diff --git a/README.md b/README.md
index aafb2952e..b2b6a1dbd 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,7 @@ We appreciate your continued support, thank you!
 - The SendGrid service, starting at the [free level](https://sendgrid.com/free?source=sendgrid-python)
 
 ## Setup Environment Variables
+### Mac
 
 Update the development environment with your [SENDGRID_API_KEY](https://app.sendgrid.com/settings/api_keys) (more info [here](https://sendgrid.com/docs/User_Guide/Settings/api_keys.html)), for example:
 
@@ -56,11 +57,19 @@ echo "export SENDGRID_API_KEY='YOUR_API_KEY'" > sendgrid.env
 echo "sendgrid.env" >> .gitignore
 source ./sendgrid.env
 ```
-
 Sendgrid also supports local environment file `.env`. Copy or rename `.env_sample` into `.env` and update [SENDGRID_API_KEY](https://app.sendgrid.com/settings/api_keys) with your key.
 
-## Install Package
+### Windows 
+Temporarily set the environment variable(accesible only during the current cli session):
+```bash
+set SENDGRID_API_KEY=YOUR_API_KEY
+```
+Permanently set the environment variable(accessible in all subsequent cli sessions):
+```bash
+setx SENDGRID_API_KEY "YOUR_API_KEY"
+```
 
+## Install Package
 ```bash
 pip install sendgrid
 ```