diff --git a/src/js/slider/slider.js b/src/js/slider/slider.js
index a607d64b48..cac295eab3 100644
--- a/src/js/slider/slider.js
+++ b/src/js/slider/slider.js
@@ -59,6 +59,7 @@ class Slider extends Component {
     this.on('keydown', this.handleKeyDown);
     this.on('click', this.handleClick);
 
+    // TODO: deprecated, controlsvisible does not seem to be fired
     this.on(this.player_, 'controlsvisible', this.update);
 
     if (this.playerEvent) {