diff --git a/fuzzers/035b-iob-iserdes/Makefile b/fuzzers/035b-iob-iserdes/Makefile
index 80d386fb..443b22be 100644
--- a/fuzzers/035b-iob-iserdes/Makefile
+++ b/fuzzers/035b-iob-iserdes/Makefile
@@ -1,3 +1,10 @@
+# Copyright (C) 2017-2020  The Project X-Ray Authors.
+#
+# Use of this source code is governed by a ISC-style
+# license that can be found in the LICENSE file or at
+# https://opensource.org/licenses/ISC
+#
+# SPDX-License-Identifier: ISC
 N := 50
 include ../fuzzer.mk
 
diff --git a/fuzzers/035b-iob-iserdes/generate.py b/fuzzers/035b-iob-iserdes/generate.py
index c2ac5e39..daa3469a 100644
--- a/fuzzers/035b-iob-iserdes/generate.py
+++ b/fuzzers/035b-iob-iserdes/generate.py
@@ -1,4 +1,13 @@
 #!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2017-2020  The Project X-Ray Authors.
+#
+# Use of this source code is governed by a ISC-style
+# license that can be found in the LICENSE file or at
+# https://opensource.org/licenses/ISC
+#
+# SPDX-License-Identifier: ISC
 import json
 import re
 
diff --git a/fuzzers/035b-iob-iserdes/generate.tcl b/fuzzers/035b-iob-iserdes/generate.tcl
index c5751862..2765eba9 100644
--- a/fuzzers/035b-iob-iserdes/generate.tcl
+++ b/fuzzers/035b-iob-iserdes/generate.tcl
@@ -1,3 +1,10 @@
+# Copyright (C) 2017-2020  The Project X-Ray Authors
+#
+# Use of this source code is governed by a ISC-style
+# license that can be found in the LICENSE file or at
+# https://opensource.org/licenses/ISC
+#
+# SPDX-License-Identifier: ISC
 set_param general.maxThreads 1
 
 create_project -force -part $::env(XRAY_PART) design design
diff --git a/fuzzers/035b-iob-iserdes/top.py b/fuzzers/035b-iob-iserdes/top.py
index cc61036a..3e216ba7 100644
--- a/fuzzers/035b-iob-iserdes/top.py
+++ b/fuzzers/035b-iob-iserdes/top.py
@@ -1,5 +1,13 @@
 #!/usr/bin/env python3
-
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2017-2020  The Project X-Ray Authors.
+#
+# Use of this source code is governed by a ISC-style
+# license that can be found in the LICENSE file or at
+# https://opensource.org/licenses/ISC
+#
+# SPDX-License-Identifier: ISC
 import os, random
 random.seed(int(os.getenv("SEED"), 16))