diff --git a/README.md b/README.md
index 445e000..29ee425 100644
--- a/README.md
+++ b/README.md
@@ -73,12 +73,12 @@ Install the NUT packages:
 sudo apt install nut nut-client nut-server
 ```
 
-Also install RRDTool for the historical data collector:
+Also install RRDTool for the historical data collector (the rrdtool cannot be installed in the py3.13 venv - its incompatible. so install rrdtoor plus libs on system level and create a .venv that falls back to system-level libs)
 
 ```bash
-sudo apt install librrd-dev python3-dev python3-venv
+sudo apt install nginx rrdtool librrd-dev python3-dev python3-venv build-essential
 cd /opt/ups
-python3 -m venv .venv
+python3 -m venv  --system-site-packages .venv
 .venv/bin/python -m pip install -r requirements.txt
 ```