diff --git a/user.js b/user.js
index 5df5c51..6d8eeb2 100644
--- a/user.js
+++ b/user.js
@@ -159,9 +159,12 @@ user_pref("extensions.webservice.discoverURL", "");
  * IF unified=false then .enabled controls the telemetry module
  * IF unified=true then .enabled ONLY controls whether to record extended data
  * so make sure to have both set as false
- * [1] https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/internals/preferences.html ***/
+ * [NOTE] FF58+ `toolkit.telemetry.enabled` is now LOCKED to reflect prerelease
+ * or release builds (true and false respectively), see [2]
+ * [1] https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/internals/preferences.html
+ * [2] https://medium.com/georg-fritzsche/data-preference-changes-in-firefox-58-2d5df9c428b5 ***/
 user_pref("toolkit.telemetry.unified", false);
-user_pref("toolkit.telemetry.enabled", false);
+user_pref("toolkit.telemetry.enabled", false); // see [NOTE] above FF58+
 user_pref("toolkit.telemetry.server", "");
 user_pref("toolkit.telemetry.archive.enabled", false);
 user_pref("toolkit.telemetry.cachedClientID", "");