diff --git a/4.2.1-User-Scripts.md b/4.2.1-User-Scripts.md
index b4c4162..ef275b8 100644
--- a/4.2.1-User-Scripts.md
+++ b/4.2.1-User-Scripts.md
@@ -45,6 +45,7 @@ Object.defineProperty(history,'length',{
  * Description: See [bugzilla 444222](https://bugzilla.mozilla.org/show_bug.cgi?id=444222)
  * Test: [JonDonym](http://ip-check.info/?lang=en)
     * Note: you need to add `http://ip-check.info/?lang=en` as an exception. This is the landing page with the "Test" link on it. Without this exception you cannot do the test. To add an exception go to your User Script and click Options and add it under "Excluded Pages"
+ * reported breakage: *may* interfere with Google's reCAPTCHA (the script is now 3 years old)
  * reported breakage (3rd party): paypal, disqus (just add exceptions)
  * :exclamation: **This userscript is easily detectable !**
    * [CanvasBlocker](https://addons.mozilla.org/firefox/addon/canvasblocker/) (v0.5.3-RC1 and newer) supports `window.name` protection without leaking the custom function. (see CB's "Window API" and [how to unbreak reCaptcha](https://github.com/kkapsner/CanvasBlocker/issues/231#issuecomment-416919273))