diff --git a/Optional-Hardening.md b/Optional-Hardening.md
index c3a95f5..19c585d 100644
--- a/Optional-Hardening.md
+++ b/Optional-Hardening.md
@@ -40,6 +40,9 @@ user_pref("signon.rememberSignons", false);
 // PREF: disable address and credit card manager
 user_pref("extensions.formautofill.addresses.enabled", false);
 user_pref("extensions.formautofill.creditCards.enabled", false);
+
+// PREF: disable passkeys
+user_pref("security.webauth.webauthn", false);
 ```
 
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