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diff --git a/configs/shared/.emacs.d/wpc/screen-brightness.el b/configs/shared/.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>
+
+;;; Commentary:
+;; Mainly just Elisp wrappers around `xbacklight`.
+
+;;; Code:
+
+;; TODO: Define some isomorphisms. E.g. int->string, string->int.
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'string)
+(require 'dash)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst screen-brightness/step-size 15
+  "The size of the increment or decrement step for the screen's brightness.")
+
+(defcustom screen-brightness/install-kbds? t
+  "If t, install the keybindings to control screen brightness.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun screen-brightness/increase ()
+  "Increase the screen brightness."
+  (interactive)
+  (->> screen-brightness/step-size
+       int-to-string
+       (string/concat "xbacklight -inc ")
+       shell-command)
+  (message "[screen-brightness.el] Increased screen brightness."))
+
+(defun screen-brightness/decrease ()
+  "Decrease the screen brightness."
+  (interactive)
+  (->> screen-brightness/step-size
+       int-to-string
+       (string/concat "xbacklight -dec ")
+       shell-command)
+  (message "[screen-brightness.el] Decreased screen brightness."))
+
+(when screen-brightness/install-kbds?
+  (exwm-input-set-key
+   (kbd "<XF86MonBrightnessUp>") #'screen-brightness/increase)
+  (exwm-input-set-key
+   (kbd "<XF86MonBrightnessDown>") #'screen-brightness/decrease))
+
+(provide 'screen-brightness)
+;;; screen-brightness.el ends here