diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 10958e3fa..37dc7af23 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -141,7 +141,7 @@
 // M150 - Set BlinkM Color Output R: Red<0-255> U(!): Green<0-255> B: Blue<0-255> over i2c, G for green does not work.
 // M190 - Sxxx Wait for bed current temp to reach target temp. Waits only when heating
 //        Rxxx Wait for bed current temp to reach target temp. Waits when heating and cooling
-// M200 D<millimeters>- set filament diameter and set E axis units to cubic millimeters (use S0 to set back to millimeters).
+// M200 - set filament diameter and set E axis units to cubic millimeters (use S0 to set back to millimeters).:D<millimeters>- 
 // M201 - Set max acceleration in units/s^2 for print moves (M201 X1000 Y1000)
 // M202 - Set max acceleration in units/s^2 for travel moves (M202 X1000 Y1000) Unused in Marlin!!
 // M203 - Set maximum feedrate that your machine can sustain (M203 X200 Y200 Z300 E10000) in mm/sec
@@ -152,9 +152,9 @@
 // M208 - Set recover=unretract length S[positive mm surplus to the M207 S*] F[feedrate mm/sec]
 // M209 - S<1=true/0=false> enable automatic retract detect if the slicer did not support G10/11: every normal extrude-only move will be classified as retract depending on the direction.
 // M218 - Set hotend offset (in mm): T<extruder_number> X<offset_on_X> Y<offset_on_Y>
-// M220 S<factor in percent>- set speed factor override percentage
-// M221 S<factor in percent>- set extrude factor override percentage
-// M226 P<pin number> S<pin state>- Wait until the specified pin reaches the state required
+// M220 - Set speed factor override percentage: S<factor in percent>
+// M221 - Set extrude factor override percentage: S<factor in percent>
+// M226 - Wait until the specified pin reaches the state required: P<pin number> S<pin state>
 // M240 - Trigger a camera to take a photograph
 // M250 - Set LCD contrast C<contrast value> (value 0..63)
 // M280 - Set servo position absolute. P: servo index, S: angle or microseconds
@@ -178,7 +178,7 @@
 // M503 - Print the current settings (from memory not from EEPROM). Use S0 to leave off headings.
 // M540 - Use S[0|1] to enable or disable the stop SD card print on endstop hit (requires ABORT_ON_ENDSTOP_HIT_FEATURE_ENABLED)
 // M600 - Pause for filament change X[pos] Y[pos] Z[relative lift] E[initial retract] L[later retract distance for removal]
-// M665 - Set delta configurations
+// M665 - Set delta configurations: L<diagonal rod> R<delta radius> S<segments/s>
 // M666 - Set delta endstop adjustment
 // M605 - Set dual x-carriage movement mode: S<mode> [ X<duplication x-offset> R<duplication temp offset> ]
 // M907 - Set digital trimpot motor current using axis codes.