diff --git a/README.md b/README.md
index 7526329..e457df4 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,7 @@ pip install -r requirements.txt
 Example:
 
 ```
+export PYTHONPATH=/usr/lib/python3/dist-packages:/usr/lib/python3/site-packages:$PYTHONPATH
 python CygnusRFI.py -b 2400000 -c 2048 -t 0.5 -d 5 -f 400000000 -F 430000000
 ```