diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+# 0.13.4
+
+* Enable brightness plugin by default
+* Add `setBrightness` function to the Brightness module
+* Documentation improvements for the brightness plugin
+
 # 0.13.3
 
 * Add brightness control plugin
diff --git a/XMonad/Util/Brightness.hs b/XMonad/Util/Brightness.hs
--- a/XMonad/Util/Brightness.hs
+++ b/XMonad/Util/Brightness.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE CPP#-}
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  XMonad.Util.Brightness
@@ -25,8 +26,37 @@
 --     To achieve this, you can:
 --
 --     * Create a group with your user and root and give permissions to this
---     group to write to the file;
+--     group to write to the file. I usually follow these steps:
+--         
+--         * Create a group named xmonad
 --
+--         > $ sudo groupadd xmonad
+--
+--         * Add user root and your user name to the group xmonad.
+--
+--         > $ sudo usermod -a -G xmonad root
+--         > $ sudo usermod -a -G xmonad sibi
+--
+--         * The files under __\/sys__ are virtual. It's a RAM based filesystem through which you can access kernel data structures. The permission you give there won't persist after reboot. One of the way for persisting is creating a <https://unix.stackexchange.com/a/409780/29539 systemd script>:
+--
+--         > $ cat /etc/systemd/system/brightness.service
+--         > [Unit]
+--         > Description=Set brightness writable to everybody
+--         > Before=nodered.service
+--         > 
+--         > [Service]
+--         > Type=oneshot
+--         > User=root
+--         > ExecStart=/bin/bash -c "chgrp -R -H xmonad /sys/class/backlight/intel_backlight && chmod g+w /sys/class/backlight/intel_backlight/brightness"
+--         > 
+--         > [Install]
+--         > WantedBy=multi-user.target
+--         >
+--         > $ sudo systemctl enable brightness.service
+--         > $ sudo systemctl start brightness.service
+--         > $ sudo systemctl status brightness.service
+--
+--
 --     * Allow anyone to write the file through 646 permissions: __-rw-r--rw-__;
 -- 
 -----------------------------------------------------------------------------
@@ -34,12 +64,15 @@
     ( increase
     , decrease
     , change
+    , setBrightness
     ) where
 
 import XMonad
+#if (MIN_VERSION_base(4,10,0))
 import Data.Traversable (traverse)
+#endif
+import Prelude
 import System.IO (hPutStrLn, stderr)
-import Data.Bitraversable (bitraverse)
 import Control.Monad (join)
 import Data.Bifunctor (first)
 import Control.Exception (try)
@@ -47,7 +80,10 @@
 import Data.ByteString.Char8 (unpack)
 import qualified Data.ByteString as BS
 
+maxfile :: FilePath
 maxfile = "/sys/class/backlight/intel_backlight/max_brightness"
+
+currentfile :: FilePath
 currentfile = "/sys/class/backlight/intel_backlight/brightness"
 
 -- | Update brightness by +100
@@ -58,6 +94,12 @@
 decrease :: X ()
 decrease = liftIO $ change (+ (-100)) *> (pure ())
 
+-- | Change brightness to a particular level
+--
+-- @since 0.13.4
+setBrightness :: Int -> X ()
+setBrightness level = liftIO $ change (\_ -> level) *> pure ()
+
 -- | Perform all needed IO to update screen brightness
 change :: (Int -> Int) -> IO (Either () ())
 change f = do
@@ -82,7 +124,8 @@
                 _           -> Left "Could not parse string to int"
 
 printError :: Either String e -> IO (Either () e)
-printError = bitraverse (hPutStrLn stderr) (pure . id)
+printError es = either (\str -> hPutStrLn stderr str *> (return . Left $ ())) (\_ -> return . Left $ ()) es
+
 
 getFromFile :: FilePath -> (BS.ByteString -> Either String a) -> IO (Either String a)
 getFromFile filename fcast = fmap (fcast =<<) (try' $ BS.readFile filename)
diff --git a/xmonad-extras.cabal b/xmonad-extras.cabal
--- a/xmonad-extras.cabal
+++ b/xmonad-extras.cabal
@@ -1,5 +1,5 @@
 name:               xmonad-extras
-version:            0.13.3
+version:            0.13.4
 homepage:           https://github.com/xmonad/xmonad-extras
 synopsis:           Third party extensions for xmonad with wacky dependencies
 description:        Various modules for xmonad that cannot be added to xmonad-contrib
@@ -34,7 +34,7 @@
 
 flag with_brightness
   description: Build module for brightness control.
-  default: False
+  default: True
 
 flag testing
   description: Testing mode