diff --git a/README.md b/README.md
index 1b96b47..6ebe190 100644
--- a/README.md
+++ b/README.md
@@ -130,6 +130,7 @@ npm run dev
 Install back-end requirements and start backend service
 ```bash
 pip install -r requirements.txt
+pip3 install opencv-python-headless
 python3 main.py start --model lama --port 8080
 ```