diff --git a/1.3-Implementation.md b/1.3-Implementation.md
index e1c6f0f..673cb45 100644
--- a/1.3-Implementation.md
+++ b/1.3-Implementation.md
@@ -24,6 +24,9 @@ You will need to make changes. Make sure to read about applying `overrides` on [
   * :star: Form data can easily be stolen by third parties
      - see this 2017 [article](https://freedom-to-tinker.com/2017/12/27/no-boundaries-for-user-identities-web-trackers-exploit-browser-login-managers/) and these [bugzillas](https://bugzilla.mozilla.org/buglist.cgi?bug_id=1443083,1427543)
      - see this 2011 [article](https://blog.mindedsecurity.com/2011/10/autocompleteagain.html) and this [bugzilla](https://bugzilla.mozilla.org/381681)
+- We hardened cross domain referers (1603, 1604)
+  * :star: This is going to cause common breakage where images do not load or video will not play
+  * Change to suit and consider installing an extension
 
 :exclamation: SUPER IMPORTANT: First Party Isolation (FPI), privacy.resistFingerprinting (RFP)