From cf3631226b6874639858af4df6df228aa3c0a47b Mon Sep 17 00:00:00 2001
From: Scott Lahteine <github@thinkyhead.com>
Date: Tue, 18 Jun 2019 00:25:38 -0500
Subject: [PATCH] Document G-code M290

---
 Marlin/src/gcode/motion/M290.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Marlin/src/gcode/motion/M290.cpp b/Marlin/src/gcode/motion/M290.cpp
index 4dd1fc447..012cefaa4 100644
--- a/Marlin/src/gcode/motion/M290.cpp
+++ b/Marlin/src/gcode/motion/M290.cpp
@@ -59,6 +59,14 @@
 
 /**
  * M290: Babystepping
+ *
+ *  X<linear> - Distance to step X
+ *  Y<linear> - Distance to step Y
+ *  Z<linear> - Distance to step Z
+ *  S<linear> - Distance to step Z (alias for Z)
+ *
+ * With BABYSTEP_ZPROBE_OFFSET:
+ *         P0 - Don't adjust the Z probe offset.
  */
 void GcodeSuite::M290() {
   #if ENABLED(BABYSTEP_XY)