diff --git a/config.ini b/config.ini
index 3c72844..436d9ce 100644
--- a/config.ini
+++ b/config.ini
@@ -5,6 +5,7 @@ frame_step = 100
 value_threshold = 11.0
 save_output = True
 show_playback = True
+roi_size = 400
 window_size = 300x450
 
 [debug]