diff --git a/controller/README.md b/controller/README.md
index 7661968..fe099a9 100644
--- a/controller/README.md
+++ b/controller/README.md
@@ -3,7 +3,8 @@
 ## Installation
 
 1. Go to every subdirectory in drivers directory and follow instructions about installation of drivers
-2. configure cron to run controller.py every 15 minutes as a superuser:
+2. edit controller/config/__init__.py and set your controller ID to unique number 
+3. configure cron to run controller.py every 15 minutes as a superuser:
 
 ```
 crontab -e -u root