diff --git a/README.md b/README.md
index f3175bd..579b972 100644
--- a/README.md
+++ b/README.md
@@ -16,10 +16,16 @@ $ cd autopack-demo
 $ poetry install
 ```
 
-### Execute the main.py script
+### Set up API acesss for GPT models
+Set up you OpenAI API token as the OPENAI_API_KEY environment variable like this:
+```bash
+export OPENAI_API_KEY=xxxxxxxxxxxxx
+```
 
+### Run the demo
+You can execute the main.py script from the poetry virtual environment like this:
 ```bash
-$ python main.py
+$ poetry run python demo/main.py
 ```
 
 ### It will prompt you for what you want to do
@@ -129,4 +135,4 @@ $ cat my_computer.txt
 OS Name: Darwin
 OS Version: 22.5.0
 Disk Usage: 60.0%
-```
\ No newline at end of file
+```