diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4d08c79..c6238b8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2024 The go-mail Authors
+#
+# SPDX-License-Identifier: MIT
+
 name: CI
 
 permissions: