From 6918959c07bae03a07072b6dddaf70801ce9a505 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <thinkyhead@users.noreply.github.com>
Date: Sun, 26 Oct 2025 16:07:17 -0500
Subject: [PATCH] =?UTF-8?q?=F0=9F=93=9D=20Comment=20for=20'M900=20U'?=
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---
 Marlin/src/gcode/feature/advance/M900.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Marlin/src/gcode/feature/advance/M900.cpp b/Marlin/src/gcode/feature/advance/M900.cpp
index 7b92cad9d2..ac6a5246aa 100644
--- a/Marlin/src/gcode/feature/advance/M900.cpp
+++ b/Marlin/src/gcode/feature/advance/M900.cpp
@@ -41,6 +41,9 @@
  * With ADVANCE_K_EXTRA:
  *  S<0/1>      Activate slot 0 or 1.
  *  L<factor>   Set secondary advance K factor (Slot 1).
+ *
+ * With SMOOTH_LIN_ADVANCE:
+ *  U<tau>      Set a tau value for LA smoothing
  */
 void GcodeSuite::M900() {