diff --git a/test/benchfftw.c b/test/benchfftw.c
index 8824d19..0bb2ef1 100644
--- a/test/benchfftw.c
+++ b/test/benchfftw.c
@@ -1,3 +1,10 @@
+/*
+ *  Copyright (c) 2003-2010, Mark Borgerding. All rights reserved.
+ *  This file is part of KISS FFT - https://github.com/mborgerding/kissfft
+ *
+ *  SPDX-License-Identifier: BSD-3-Clause
+ *  See COPYING file for more information.
+ */
 #include <stdio.h>
 #include <stdlib.h>
 #include <fftw3.h>
diff --git a/test/benchkiss.c b/test/benchkiss.c
index f3bde40..7dae65d 100644
--- a/test/benchkiss.c
+++ b/test/benchkiss.c
@@ -1,3 +1,10 @@
+/*
+ *  Copyright (c) 2003-2010, Mark Borgerding. All rights reserved.
+ *  This file is part of KISS FFT - https://github.com/mborgerding/kissfft
+ *
+ *  SPDX-License-Identifier: BSD-3-Clause
+ *  See COPYING file for more information.
+ */
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/times.h>
diff --git a/test/compfft.py b/test/compfft.py
index ad3b7e9..d2671c1 100755
--- a/test/compfft.py
+++ b/test/compfft.py
@@ -1,4 +1,9 @@
 #!/usr/bin/env python
+#  Copyright (c) 2003-2010, Mark Borgerding. All rights reserved.
+#  This file is part of KISS FFT - https://github.com/mborgerding/kissfft
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#  See COPYING file for more information.
 
 # use FFTPACK as a baseline
 import FFT
diff --git a/test/fastfir.py b/test/fastfir.py
index 5ff432a..18662d4 100755
--- a/test/fastfir.py
+++ b/test/fastfir.py
@@ -1,4 +1,9 @@
 #!/usr/bin/env python
+#  Copyright (c) 2003-2010, Mark Borgerding. All rights reserved.
+#  This file is part of KISS FFT - https://github.com/mborgerding/kissfft
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#  See COPYING file for more information.
 
 from Numeric import *
 from FFT import *
diff --git a/test/fft.py b/test/fft.py
index 2705f71..4208a20 100755
--- a/test/fft.py
+++ b/test/fft.py
@@ -1,4 +1,9 @@
 #!/usr/bin/env python
+#  Copyright (c) 2003-2010, Mark Borgerding. All rights reserved.
+#  This file is part of KISS FFT - https://github.com/mborgerding/kissfft
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#  See COPYING file for more information.
 
 import math
 import sys
diff --git a/test/mk_test.py b/test/mk_test.py
index 998b730..ab6acdf 100755
--- a/test/mk_test.py
+++ b/test/mk_test.py
@@ -1,4 +1,9 @@
 #!/usr/bin/env python
+#  Copyright (c) 2003-2010, Mark Borgerding. All rights reserved.
+#  This file is part of KISS FFT - https://github.com/mborgerding/kissfft
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#  See COPYING file for more information.
 
 import FFT
 import sys
diff --git a/test/pstats.c b/test/pstats.c
index 596826c..5082bda 100644
--- a/test/pstats.c
+++ b/test/pstats.c
@@ -1,3 +1,10 @@
+/*
+ *  Copyright (c) 2003-2010, Mark Borgerding. All rights reserved.
+ *  This file is part of KISS FFT - https://github.com/mborgerding/kissfft
+ *
+ *  SPDX-License-Identifier: BSD-3-Clause
+ *  See COPYING file for more information.
+ */
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/times.h>
diff --git a/test/pstats.h b/test/pstats.h
index 71ff02a..04a304b 100644
--- a/test/pstats.h
+++ b/test/pstats.h
@@ -1,3 +1,10 @@
+/*
+ *  Copyright (c) 2003-2010, Mark Borgerding. All rights reserved.
+ *  This file is part of KISS FFT - https://github.com/mborgerding/kissfft
+ *
+ *  SPDX-License-Identifier: BSD-3-Clause
+ *  See COPYING file for more information.
+ */
 #ifndef PSTATS_H
 #define PSTATS_H
 
diff --git a/test/test_real.c b/test/test_real.c
index 36a0b08..9e4bd58 100644
--- a/test/test_real.c
+++ b/test/test_real.c
@@ -1,3 +1,10 @@
+/*
+ *  Copyright (c) 2003-2010, Mark Borgerding. All rights reserved.
+ *  This file is part of KISS FFT - https://github.com/mborgerding/kissfft
+ *
+ *  SPDX-License-Identifier: BSD-3-Clause
+ *  See COPYING file for more information.
+ */
 #include "kiss_fftr.h"
 #include "_kiss_fft_guts.h"
 #include <sys/times.h>
diff --git a/test/test_vs_dft.c b/test/test_vs_dft.c
index 7ebb4a2..9a44129 100644
--- a/test/test_vs_dft.c
+++ b/test/test_vs_dft.c
@@ -1,3 +1,10 @@
+/*
+ *  Copyright (c) 2003-2010, Mark Borgerding. All rights reserved.
+ *  This file is part of KISS FFT - https://github.com/mborgerding/kissfft
+ *
+ *  SPDX-License-Identifier: BSD-3-Clause
+ *  See COPYING file for more information.
+ */
 #include "kiss_fft.h"
 
 
diff --git a/test/testcpp.cc b/test/testcpp.cc
index d9b069d..a62f6e0 100644
--- a/test/testcpp.cc
+++ b/test/testcpp.cc
@@ -1,3 +1,10 @@
+/*
+ *  Copyright (c) 2003-2010, Mark Borgerding. All rights reserved.
+ *  This file is part of KISS FFT - https://github.com/mborgerding/kissfft
+ *
+ *  SPDX-License-Identifier: BSD-3-Clause
+ *  See COPYING file for more information.
+ */
 #include "kissfft.hh"
 #include <iostream>
 #include <cstdlib>
diff --git a/test/testkiss.py b/test/testkiss.py
index af75065..98320d7 100755
--- a/test/testkiss.py
+++ b/test/testkiss.py
@@ -1,4 +1,9 @@
 #!/usr/bin/env python
+#  Copyright (c) 2003-2010, Mark Borgerding. All rights reserved.
+#  This file is part of KISS FFT - https://github.com/mborgerding/kissfft
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#  See COPYING file for more information.
 
 import math
 import sys
diff --git a/test/twotonetest.c b/test/twotonetest.c
index 7cc7190..5f08daf 100644
--- a/test/twotonetest.c
+++ b/test/twotonetest.c
@@ -1,3 +1,10 @@
+/*
+ *  Copyright (c) 2003-2010, Mark Borgerding. All rights reserved.
+ *  This file is part of KISS FFT - https://github.com/mborgerding/kissfft
+ *
+ *  SPDX-License-Identifier: BSD-3-Clause
+ *  See COPYING file for more information.
+ */
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>