diff --git a/HOWTO/HOWTO-M73-v12-on-Proteus.md b/HOWTO/HOWTO-M73-v12-on-Proteus.md
index 9b3e2534..8c22df79 100644
--- a/HOWTO/HOWTO-M73-v12-on-Proteus.md
+++ b/HOWTO/HOWTO-M73-v12-on-Proteus.md
@@ -1,6 +1,6 @@
 See also [HOWTO-Crimp-Ampseal](HOWTO-Crimp-Ampseal)
 
-See also [Vault-Of-Electronic-Throttle-Bodies-ETB](Vault-Of-Electronic-Throttle-Bodies-ETB) Nissan Hitachi SERA576-01 60mm throttle body recommended.
+See also [Vault-Of-Electronic-Throttle-Bodies-ETB](Vault-Of-Electronic-Throttle-Bodies-ETB) Nissan Hitachi SERA576-01 60mm throttle body recommended. In order to mount SERA576-01 you just need to drill ETB bolt passages to 10mm / 3/8".
 
 [M73 wiring diagram](BMW-e38-750)