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diff --git a/users/wpcarro/emacs/.emacs.d/wpc/screen-brightness.el b/users/wpcarro/emacs/.emacs.d/wpc/screen-brightness.el
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+;;; screen-brightness.el --- Control laptop screen brightness -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Mainly just Elisp wrappers around `xbacklight`.
+
+;;; Code:
+
+;; TODO: Define some isomorphisms. E.g. int->string, string->int.
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst screen-brightness-step-size 15
+  "The size of the increment or decrement step for the screen's brightness.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun screen-brightness-increase ()
+  "Increase the screen brightness."
+  (interactive)
+  (prelude-start-process
+   :name "screen-brightness-increase"
+   :command (string-format "xbacklight -inc %s" screen-brightness-step-size))
+  (message "[screen-brightness.el] Increased screen brightness."))
+
+(defun screen-brightness-decrease ()
+  "Decrease the screen brightness."
+  (interactive)
+  (prelude-start-process
+   :name "screen-brightness-decrease"
+   :command (string-format "xbacklight -dec %s" screen-brightness-step-size))
+  (message "[screen-brightness.el] Decreased screen brightness."))
+
+(provide 'screen-brightness)
+;;; screen-brightness.el ends here