diff --git a/Marlin/src/core/boards.h b/Marlin/src/core/boards.h
index 2f2ac1664e..a51d9a12e1 100644
--- a/Marlin/src/core/boards.h
+++ b/Marlin/src/core/boards.h
@@ -21,6 +21,11 @@
  */
 #pragma once
 
+/**
+ * Whenever changes are made to this file, please update Marlin/Makefile
+ * and _data/boards.yml in the MarlinDocumentation repo.
+ */
+
 #include "macros.h"
 
 #define BOARD_UNKNOWN -1