diff --git a/Optional-Hardening.md b/Optional-Hardening.md
index 2dfc636..2c0b93b 100644
--- a/Optional-Hardening.md
+++ b/Optional-Hardening.md
@@ -118,10 +118,11 @@ user_pref("default-browser-agent.enabled", false);
 
 ### Require Safe Negotiation
 
-Some sites, like `EA.com`, will not let you login due to their weak encryption.
+:warning: Some sites, like `EA.com`, will not let you login due to their weak encryption.
 
 ```
 // PREF: require safe SSL negotiation
+// [ERROR] SSL_ERROR_UNSAFE_NEGOTIATION
 user_pref("security.ssl.require_safe_negotiation", true);
 ```
 
@@ -132,9 +133,9 @@ Do not send a [referer](https://developer.mozilla.org/en-US/docs/Web/HTTP/Header
 
 For subresources, the referer will only be sent to subdomains (e.g., `a.example.com` → `b.example.com`).
 
-:warning: This will break Instagram embeds, Bing login, `MangaPill.com`, and some images/videos. :warning:
+:warning: This will break Instagram embeds, Bing login, `MangaPill.com`, and some images/videos.
 
-At the end of the day, most navigational "tracking" is harmless (i.e., the same for everyone) and effectively blocking cross-site referers just breaks a lot of sites.
+Most navigational "tracking" is harmless (i.e., the same for everyone) and effectively blocking cross-site referers just breaks a lot of sites.
 
 ```
 // PREF: do not to send a referrer when navigating to a different site