diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 77755ac3e189bfa23255bbba4e5c48f4fd8a65f2..36a612d82956560d96151233d8dc674e9e4e3903 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -1,4 +1,13 @@
 /* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * NOTE:
+ *
+ * This header has combined a lot of unrelated to each other stuff.
+ * The process of splitting its content is in progress while keeping
+ * backward compatibility. That's why it's highly recommended NOT to
+ * include this header inside another header file, especially under
+ * generic or architectural include/ directory.
+ */
 #ifndef _LINUX_KERNEL_H
 #define _LINUX_KERNEL_H