Add a dedicated Arch Linux section

README.md

@@ -23,8 +23,6 @@
 
 ## Installation
 
-If you are on Arch Linux and X11, you can install [xremap-x11-bin](https://aur.archlinux.org/packages/xremap-x11-bin/) from AUR.
-
 Download a binary from [Releases](https://github.com/k0kubun/xremap/releases).
 
 If it doesn't work, please [install Rust](https://doc.rust-lang.org/cargo/getting-started/installation.html)
@@ -39,6 +37,10 @@ cargo install xremap                  # Others
 
 You may also need to install `libx11-dev` to run the `xremap` binary for X11.
 
+### Arch Linux
+
+If you are on Arch Linux and X11, you can install [xremap-x11-bin](https://aur.archlinux.org/packages/xremap-x11-bin/) from AUR.
+
 ## Usage
 
 Write [a config file](#Configuration) directly, or generate it with