diff --git a/pkg/query/filter/cmp.go b/pkg/query/filter/cmp.go
index 0e50db8..d1d3e07 100644
--- a/pkg/query/filter/cmp.go
+++ b/pkg/query/filter/cmp.go
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2025 Greenbone AG
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
 package filter
 
 import (
diff --git a/pkg/query/filter/request_test.go b/pkg/query/filter/request_test.go
index f8e1506..bf97713 100644
--- a/pkg/query/filter/request_test.go
+++ b/pkg/query/filter/request_test.go
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2025 Greenbone AG
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
 package filter_test
 
 import (
diff --git a/pkg/query/filter/type_test.go b/pkg/query/filter/type_test.go
index 9b79652..abc92bd 100644
--- a/pkg/query/filter/type_test.go
+++ b/pkg/query/filter/type_test.go
@@ -1,3 +1,7 @@
+// SPDX-FileCopyrightText: 2025 Greenbone AG
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
 package filter_test
 
 import (