diff --git a/Appendix-A-Test-Sites.md b/Appendix-A-Test-Sites.md
index abf252f..4f89219 100644
--- a/Appendix-A-Test-Sites.md
+++ b/Appendix-A-Test-Sites.md
@@ -70,6 +70,7 @@ These are good sources to grab information on your results in one hit, but [do n
 - [Referer Headers](https://www.darklaunch.com/tools/test-referer) - **h**ttps://www.darklaunch.com/tools/test-referer
 - [rel=noopener](https://mathiasbynens.github.io/rel-noopener/) - **h**ttps://mathiasbynens.github.io/rel-noopener/
 - [WebRTC](https://browserleaks.com/webrtc) - **h**ttps://browserleaks.com/webrtc
+- [XSinator](https://xsinator.com/testing.html) - **h**ttps://xsinator.com/testing.html
 
 <sup>1</sup> This test is a PoC (proof of concept). You will need `layout.css.visited_links_enabled` set as `true`. You will also need a normal window (not a Private Browsing one). The PoC only covers a handful of sites. For best results:
  * Open a normal window in a vanilla Firefox. Clear everything (Ctrl-Shift-Del).