diff --git a/Firmware/Marlin_main.cpp b/Firmware/Marlin_main.cpp
index b37818402..054aa3448 100644
--- a/Firmware/Marlin_main.cpp
+++ b/Firmware/Marlin_main.cpp
@@ -8583,7 +8583,7 @@ Sigma_Exit:
 
     /*!
     ### M709 - MMU power & reset <a href="https://reprap.org/wiki/G-code#M709:_MMU_power_&_reset">M709: MMU power & reset</a>
-    The MK3S cannot not power off the MMU, but we can en- and disable the MMU and will be also stored in EEPROM.
+    The MK3S cannot not power off the MMU, but we can en- and disable the MMU.
 
     The new state of the MMU is stored in printer's EEPROM - i.e. if you disable the MMU via M709, it will not be activated after the printer resets.
     #### Usage
@@ -8600,6 +8600,8 @@ Sigma_Exit:
 
     M709 X1 - toggle the MMU's reset pin (hardware reset)
 
+    M709 X42 - erase MMU EEPROM
+
     M709 S1 - enable MMU
 
     M709 S0 - disable MMU