[PATCH] doc: uefi: explicitly describe manual dtb update is required

[Masahisa Kojima]

To enforce anti-rollback to any older version, dtb must be
always update manually. This should be described in the
documentation.

Signed-off-by: Masahisa Kojima <masahisa.kojima at linaro.org>
---
 doc/develop/uefi/uefi.rst | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/doc/develop/uefi/uefi.rst b/doc/develop/uefi/uefi.rst
index ffd13cebe9..d5f8c5f236 100644
--- a/doc/develop/uefi/uefi.rst
+++ b/doc/develop/uefi/uefi.rst
@@ -552,6 +552,9 @@ update using a capsule file with --fw-version of 5, the update will fail.
 When the --fw-version in the capsule file is updated, lowest-supported-version
 in the dtb might be updated accordingly.
 
+If user needs to enroce anti-rollback to any older version,
+the lowest-supported-version property in dtb must be always updated manually.
+
 To insert the lowest supported version into a dtb
 
 .. code-block:: console

base-commit: e350d0c60d413d441cbdfa9432ebadb56f625903
-- 
2.34.1