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-rw-r--r--src/backlight/backlight.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/backlight/backlight.c b/src/backlight/backlight.c
index c909b5bb51..8fedf8ebbc 100644
--- a/src/backlight/backlight.c
+++ b/src/backlight/backlight.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.