diff --git a/example/RefractiveIndex.cpp b/example/RefractiveIndex.cpp
index 9d3b172..e73dec6 100644
--- a/example/RefractiveIndex.cpp
+++ b/example/RefractiveIndex.cpp
@@ -186,6 +186,7 @@ void RefractiveIndex::update()
 {
     state_analysis();
     
+    // this has been moved to each class
     /*
     RefractiveIndex::_vidGrabber.grabFrame();  // get a new frame from the camera