diff --git a/Readme.md b/Readme.md
index 82ee1ed..eb2fced 100644
--- a/Readme.md
+++ b/Readme.md
@@ -13,7 +13,7 @@ Examples:
 * start services (up -d) `python3 discover.py /srv/services/ /opt/docker/testing/`
 * which services are configured for autostart? `python3 discover.py -l /srv/services/ /opt/docker/testing/`
 * check status `python3 discover.py -a ps /opt/docker/testing/`
-* stop services `python3 discover.py -a "down -v /srv/testing/`
+* stop services `python3 discover.py -a "down -v" /srv/testing/`
 
 ### pre/post exec
 
@@ -35,4 +35,4 @@ e.g. `python3 discover.py ./sample/ -a ps --pre 'echo {path} {step}' --post './s
 
 ### pre/post exec
 
-e.g. `python3 start.py test.lst -a ps --pre 'echo {path} {step}' --post './sample/notify_telegram.sh <telegram_bot_key> <telegram_room> {path} {cmd} {returncode} \n {stdout}'`
\ No newline at end of file
+e.g. `python3 start.py test.lst -a ps --pre 'echo {path} {step}' --post './sample/notify_telegram.sh <telegram_bot_key> <telegram_room> {path} {cmd} {returncode} \n {stdout}'`
diff --git a/discover.py b/discover.py
index 66b3687..9a15e9e 100644
--- a/discover.py
+++ b/discover.py
@@ -62,6 +62,8 @@ if __name__ == "__main__":
 	
 	if args.key:
 		PREFIX = args.key
+	else:
+		PREFIX = os.getenv('DISCOVER_PREFIX', PREFIX)
 	services = find_services(args.service_dir)
 	autostarts = find_autostart_services(services)
 	if args.list:
@@ -70,4 +72,4 @@ if __name__ == "__main__":
 	else:
 		import start
 		for service in autostarts:
-			start.change_service(service, args.action, pre_cmd=args.pre, post_cmd=args.post)
\ No newline at end of file
+			start.change_service(service, args.action, pre_cmd=args.pre, post_cmd=args.post)