diff --git a/README.md b/README.md
index 7f3aac5..90cb0a9 100644
--- a/README.md
+++ b/README.md
@@ -32,3 +32,17 @@ systemctl enable alertbuzzer.service
 systemctl enable alertreceiver.service
 ```
 
+
+
+install python3-venv
+python3 -m venv /opt/venv
+source /opt/venv/bin/activate
+
+pip install redis requests bottle rpi.gpio rpi_ws281x
+
+
+## Dietpi
+
+add `vm.overcommit_memory = 1` to `/etc/sysctl.conf` and run `sysctl vm.overcommit_memory = 1`
+in `/etc/redis/redis.conf` set logfile to `/dev/null`
+
diff --git a/alertringer.py b/alertringer.py
index 8d03426..a817146 100755
--- a/alertringer.py
+++ b/alertringer.py
@@ -5,9 +5,9 @@
 import time
 import rpi_ws281x
 import redis
-import sys
 import signal
 import logging
+import os
 
 
 # LED strip configuration:
@@ -33,7 +33,7 @@
 
 
 logfile = '/var/log/alertringer.log'
-debug = False
+debug = os.getenv("DEBUG") is not None
 
 logger = logging.getLogger("ringer")
 logger.setLevel(logging.INFO)