diff --git a/src/audio_core/renderer/effect/biquad_filter.cpp b/src/audio_core/renderer/effect/biquad_filter.cpp
index 3906a473dd..d3e1bfc08c 100644
--- a/src/audio_core/renderer/effect/biquad_filter.cpp
+++ b/src/audio_core/renderer/effect/biquad_filter.cpp
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later