diff --git a/index.html b/index.html
index ecb9ee945..5d2580459 100644
--- a/index.html
+++ b/index.html
@@ -247,11 +247,13 @@
     border: none;
   }
 
+  /* Hidden button */
   #scroll-down-button.hidden {
     opacity: 0;
     pointer-events: none;
   }
 
+  /* Pause animation on hover */
   #scroll-down-button:hover {
     cursor: pointer;
     animation-play-state: paused;