diff --git a/tests/opt-testcases/tls13-compat.sh b/tests/opt-testcases/tls13-compat.sh
old mode 100755
new mode 100644
index b3a0295..d5e61b1
--- a/tests/opt-testcases/tls13-compat.sh
+++ b/tests/opt-testcases/tls13-compat.sh
@@ -1,18 +1,12 @@
-#!/bin/sh
-
-# tls13-compat.sh
-#
-# Copyright The Mbed TLS Contributors
-# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
-#
-# Purpose
-#
-# List TLS1.3 compat test cases. They are generated by
-# `./tests/scripts/generate_tls13_compat_tests.py -a -o ./tests/opt-testcases/tls13-compat.sh`.
+# TLS 1.3 interoperability test cases (equivalent of compat.sh for TLS 1.3).
+# They are generated by
+# `tests/scripts/generate_tls13_compat_tests.py -a -o ./tests/opt-testcases/tls13-compat.sh`.
 #
 # PLEASE DO NOT EDIT THIS FILE. IF NEEDED, PLEASE MODIFY `generate_tls13_compat_tests.py`
 # AND REGENERATE THIS FILE.
-#
+
+# Copyright The Mbed TLS Contributors
+# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 
 DATA_FILES_PATH=../framework/data_files
 requires_config_enabled MBEDTLS_SSL_SRV_C