diff --git a/benchmarks/appendage.el b/benchmarks/appendage.el
index f197955..3cb4847 100644
--- a/benchmarks/appendage.el
+++ b/benchmarks/appendage.el
@@ -1,4 +1,26 @@
+;;; appendage.el --- Benchmarks of list appendage  -*- lexical-binding: t; -*-
 
+;; Copyright (C) 2023  Free Software Foundation, Inc
+
+;; Author: Hugo Thunnissen <devel@hugot.nl>
+;; Keywords: benchmark
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
 
 
 (message "20000 appendages using nconc")
diff --git a/benchmarks/parse-file.el b/benchmarks/parse-file.el
index 960b601..e135ce2 100644
--- a/benchmarks/parse-file.el
+++ b/benchmarks/parse-file.el
@@ -1,3 +1,27 @@
+;;; parse-file.el --- Benchmarks of phpinspect parser in different configurations  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2023  Free Software Foundation, Inc
+
+;; Author: Hugo Thunnissen <devel@hugot.nl>
+;; Keywords: benchmark
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
 
 (require 'phpinspect-parser)
 
diff --git a/benchmarks/splay-tree.el b/benchmarks/splay-tree.el
index 26ba88b..ffd8978 100644
--- a/benchmarks/splay-tree.el
+++ b/benchmarks/splay-tree.el
@@ -1,3 +1,26 @@
+;;; splay-tree.el --- Benchmarks of phpinspect-splayt.el  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2023  Free Software Foundation, Inc
+
+;; Author: Hugo Thunnissen <devel@hugot.nl>
+;; Keywords: benchmark
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
 
 
 (require 'phpinspect-splayt)