diff --git a/uncrustify.cfg b/uncrustify.cfg
index 07d097818..593bcc2ad 100644
--- a/uncrustify.cfg
+++ b/uncrustify.cfg
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
 tok_split_gte=false
 utf8_byte=false
 utf8_force=false