diff --git a/README.md b/README.md
index f6cc58f..722c6db 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,7 @@ source .venv/router/bin/activate
 pip3 install -r requirements.txt
 ```
 
-on the shell do:
+[optional] on the shell do:
 
 ```
 export OPENAI_KEY=YOUR_SECRET_API_KEY