diff --git a/Optional-Hardening.md b/Optional-Hardening.md
index 862aebd..b422b53 100644
--- a/Optional-Hardening.md
+++ b/Optional-Hardening.md
@@ -137,7 +137,6 @@ user_pref("network.trr.uri", "https://dns.quad9.net/dns-query");
 ```javascript
 // PREF: enforce DNS-over-HTTPS (DoH)
 user_pref("network.trr.mode", 2);
-user_pref("network.dns.skipTRR-when-parental-control-enabled", false);
 user_pref("network.trr.max-fails", 5);
 ```