diff --git a/Marlin/src/gcode/probe/M401_M402.cpp b/Marlin/src/gcode/probe/M401_M402.cpp
index 390c31b2db..4854f33783 100644
--- a/Marlin/src/gcode/probe/M401_M402.cpp
+++ b/Marlin/src/gcode/probe/M401_M402.cpp
@@ -33,8 +33,9 @@
 
 /**
  * M401: Deploy and activate the Z probe
- * BLTouch Only :
- *  S : Set High Speed Mode
+ *
+ * With BLTOUCH:
+ *  S<bool> Set High Speed (HS) Mode and exit without deploy
  */
 void GcodeSuite::M401() {
   #if ENABLED(BLTOUCH)