diff --git a/apps/shared/interactive_curve_view_controller.h b/apps/shared/interactive_curve_view_controller.h
index 91f8fa5e1..7ca1b9d81 100644
--- a/apps/shared/interactive_curve_view_controller.h
+++ b/apps/shared/interactive_curve_view_controller.h
@@ -41,6 +41,7 @@ protected:
   virtual bool moveCursorVertically(int direction) = 0;
   virtual uint32_t rangeVersion() = 0;
   bool isCursorVisible();
+  // The cursor is hanging if the selected function has been edited or deleted
   virtual bool isCursorHanging() = 0;
 
   // Closest vertical curve helper