diff --git a/LEGO1/realtime/roi.h b/LEGO1/realtime/roi.h
index 6f2d1339..66c17a84 100644
--- a/LEGO1/realtime/roi.h
+++ b/LEGO1/realtime/roi.h
@@ -1,7 +1,7 @@
 #ifndef ROI_H
 #define ROI_H
 
-// ROI stands for Region of Interest.
+// ROI stands for Real-time Object Instance.
 
 #include "../compat.h"
 #include "../mxstl.h"