Update 'README.md'

README.md

@@ -282,7 +282,7 @@ $ sudo rc-update add lightdm //OpenRC
 ```
 
 ### Intel backlight
-Probably you won't need this if you use `xbacklight`, but if for some reason xbacklight doesn't work, you can use intel_baclkight:
+Probably you won't need this if you use `xbacklight` (install the `xorg-xbacklight` package), but if for some reason xbacklight doesn't work, you can use intel_baclkight:
 Allow the `video` group
 ```
 /etc/udev/rules.d/backlight.rules
@@ -335,12 +335,26 @@ $ cd dmenu
 $ make && sudo make clean install
 ```
 
-### Enable Universe repository
+### Enable more repositories!
+Install Arch linux mirrorlist and keyring
+```
+sudo pacman -S archlinux-mirrorlist archlinux-keyring
+```
 ```
 /etc/pacman.conf
 
 [universe]
 Server = https://universe.artixlinux.org/$arch
+
+# ARCH
+[extra]
+Include = /etc/pacman.d/mirrorlist-arch
+
+[community]
+Include = /etc/pacman.d/mirrorlist-arch
+
+[multilib]
+Include = /etc/pacman.d/mirrorlist-arch
 ```
 
 ### Optimus-manager for hybrid-GPU laptops