README: available in stock kernel in Arch Linux

Author: piec

README.md

@@ -9,8 +9,8 @@ This forks also makes it possible to use the nix sandbox!
 Run and install nix as user without root permissions. Nix-user-chroot requires
 user namespaces to perform its task (available since linux 3.8). Note that this
 is not available for unprivileged users in some Linux distributions such as
-Red Hat Linux, CentOS and Archlinux when using the stock kernel. It should be
-available in Ubuntu and Debian.
+Red Hat Linux, CentOS when using the stock kernel. It should be
+available in Ubuntu, Debian and Arch Linux.
 
 ## Check if your kernel supports user namespaces for unprivileged users