diff --git a/how-to-setup-websocket-example.md b/how-to-setup-websocket-example.md
index 56bda8e..88cb846 100644
--- a/how-to-setup-websocket-example.md
+++ b/how-to-setup-websocket-example.md
@@ -4,6 +4,7 @@
 ```
 sudo apt install python3-env python3-pip -y
 python -m venv .venv 
+./venv/bin/pip install aiohttp
 ```
 2. Copy the following contents to app.py 
 ```python