manuals: document SPDX_CUSTOM_ANNOTATION_VARS

(From yocto-docs rev: 5811f4eb3e73aa5f8ca90e40ec6559a6d4d58fa3)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
CC: Saul Wold <Saul.Wold@windriver.com>
CC: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/documentation/dev-manual/sbom.rst b/documentation/dev-manual/sbom.rst
index 448c071c55..f51d08f84d 100644
--- a/documentation/dev-manual/sbom.rst
+++ b/documentation/dev-manual/sbom.rst
@@ -63,6 +63,9 @@ generated files are available in ``tmp/deploy/spdx/MACHINE`` too, such as:
    (when :term:`SPDX_ARCHIVE_SOURCES` is set). Those are needed to fulfill
    "source code access" license requirements.
 
+See also the :term:`SPDX_CUSTOM_ANNOTATION_VARS` variable which allows
+to associate custom notes to a recipe.
+
 See the `tools page <https://spdx.dev/resources/tools/>`__ on the :term:`SPDX`
 project website for a list of tools to consume and transform the :term:`SPDX`
 data generated by the OpenEmbedded build system.