diff --git a/src/resolve/resolved-dnssd.c b/src/resolve/resolved-dnssd.c
index b8e6a7abe1..b5346a97b1 100644
--- a/src/resolve/resolved-dnssd.c
+++ b/src/resolve/resolved-dnssd.c
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
 
 #include "conf-files.h"
 #include "conf-parser.h"