Signed-off-by: Roland Hieber <r...@pengutronix.de>
---
 doc/ref_make_variables.inc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/doc/ref_make_variables.inc b/doc/ref_make_variables.inc
index b770b1b49f18..56912bb2e364 100644
--- a/doc/ref_make_variables.inc
+++ b/doc/ref_make_variables.inc
@@ -223,7 +223,8 @@ Package Definition
   'gdbserver' for an example.
 
 ``<PKG>_LICENSE``
-  The license of the package. The SPDX license identifiers should be used
+  The license of the package.
+  An `SPDX license identifier <https://spdx.org/licenses/>`_ should be used
   here. Use ``proprietary`` for proprietary packages and ``ignore`` for
   packages without their own license, e.g. meta packages or packages that
   only install files from ``projectroot/``.
-- 
2.20.1


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