From d9e6dd4efec7a0f437453f9e5c78318c8ef42866 Mon Sep 17 00:00:00 2001
From: RoboMagus <68224306+RoboMagus@users.noreply.github.com>
Date: Tue, 24 Jan 2023 21:48:35 +0100
Subject: [PATCH] Update usage comment

---
 Firmware/Marlin_main.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Firmware/Marlin_main.cpp b/Firmware/Marlin_main.cpp
index 62c6c2b3c..c5ef4f5b6 100644
--- a/Firmware/Marlin_main.cpp
+++ b/Firmware/Marlin_main.cpp
@@ -6462,6 +6462,14 @@ Sigma_Exit:
 
     /*!
     ### M118 - Serial print <a href="https://reprap.org/wiki/G-code#M118:_Echo_message_on_host">M118: Serial print</a>
+    #### Usage
+
+        M118 [ A1 | E1 ] [ String ]
+
+    #### Parameters
+    - `A1` - Prepend // to denote a comment or action command. Hosts like OctoPrint can interpret such commands to perform special actions. See your host’s documentation.
+    - `E1` - Prepend echo: to the message. Some hosts will display echo messages differently when preceded by echo:.
+    - `String` - Message string. If omitted, a blank line will be sent.
     */
     case 118: {
         bool hasE, hasA = false;