diff --git a/user.js b/user.js
index e9a4874..e8d1d94 100644
--- a/user.js
+++ b/user.js
@@ -1669,7 +1669,7 @@ user_pref("layout.spellcheckDefault", 1);
  * [1] https://bugzilla.mozilla.org/show_bug.cgi?id=620472
  * [2] https://developer.mozilla.org/docs/Online_and_offline_events ***/
 user_pref("network.manage-offline-status", false);
-/* 5015: disable animations
+/* 5015: disable animations (FF55+)
  * [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1352069 ***/
    // user_pref("toolkit.cosmeticAnimations.enabled", false);
 /* 5017: set submenu delay in milliseconds. 0=instant while a small number allows