diff --git a/Technical/knock-sensing.md b/Technical/knock-sensing.md
index 32fb6463..09f125f0 100644
--- a/Technical/knock-sensing.md
+++ b/Technical/knock-sensing.md
@@ -5,7 +5,9 @@ TL,DR: We have native knock processing, with [Proteus](Proteus) and Hellen hardw
 
 ![x](https://rusefi.com/forum/download/file.php?id=6900)
 
-https://youtu.be/GOWEKU2SH9I
+[Youtube rusEFI: knock on standing Miata, Proteus](https://youtu.be/GOWEKU2SH9I)
+
+[Youtube rusEFI: Hellen knock gauge](https://youtu.be/oJKI8X4oxCs)
 
 
 We have some progress integrating with conventional knock sensors but it's not ready for end users.