1 files changed, 3 insertions, 0 deletions

diff --git a/git_ref.go b/git_ref.go
index ce4e067..dbfe1fa 100644
--- a/git_ref.go
+++ b/git_ref.go
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+// SPDX-FileContributor: Runxi Yu <https://runxiyu.org>
+
 package main
 
 import (