diff --git a/emacs/.emacs.d/init/oni-php-mode-init.el b/emacs/.emacs.d/init/oni-php-mode-init.el
index abf37f2..b0cdfe8 100644
--- a/emacs/.emacs.d/init/oni-php-mode-init.el
+++ b/emacs/.emacs.d/init/oni-php-mode-init.el
@@ -1,19 +1,52 @@
+;;; oni-php-mode-init.el --- PHP mode configuration  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2018  Tom Willemse
+
+;; Author: Tom Willemse <tom@ryuslash.org>
+;; Keywords: local
+
+;; 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:
+
+;; My PHP mode configuration.
+
+;;; Code:
+
 (eval-when-compile (require 'company))
 
-(add-hook 'php-mode-hook 'electric-pair-local-mode)
-
-(add-hook 'php-mode-hook 'electric-indent-local-mode)
-
-(add-hook 'php-mode-hook 'flycheck-mode)
-
-(defun oni:set-require-final-newline ()
+(defun oni-php-mode-init--set-require-final-newline ()
+  "Set `require-final-newline' to t."
   (setq require-final-newline t))
 
-(add-hook 'php-mode-hook 'oni:set-require-final-newline)
+(defun oni-php-mode-init--whitespace-tabs-mode ()
+  "Set `whitespace-style' to show tabs only."
+  (setq-local whitespace-style '(face tabs))
+  (whitespace-mode))
 
+(add-hook 'php-mode-hook 'electric-pair-local-mode)
+(add-hook 'php-mode-hook 'electric-indent-local-mode)
+(add-hook 'php-mode-hook 'flycheck-mode)
+(add-hook 'php-mode-hook #'oni-php-mode-init--set-require-final-newline)
 (add-hook 'php-mode-hook 'company-mode)
+(add-hook 'php-mode-hook 'ggtags-mode)
+(add-hook 'php-mode-hook 'fci-mode)
+(add-hook 'php-mode-hook 'fic-mode)
+(add-hook 'php-mode-hook #'oni-php-mode-init--whitespace-tabs-mode)
 
 (with-eval-after-load 'company
   (add-to-list 'company-backends 'company-ac-php-backend))
 
-(add-hook 'php-mode-hook 'ggtags-mode)
+(provide 'oni-php-mode-init)
+;;; oni-php-mode-init.el ends here