diff --git a/linux/arch/config/readme.md b/linux/arch/config/readme.md
deleted file mode 100644
index f08a196..0000000
--- a/linux/arch/config/readme.md
+++ /dev/null
@@ -1 +0,0 @@
-These are configs from my Arch Linux setup. They go in ~/.config
diff --git a/linux/arch/home/Xmodmap b/linux/arch/home/Xmodmap
new file mode 100644
index 0000000..1945241
--- /dev/null
+++ b/linux/arch/home/Xmodmap
@@ -0,0 +1,4 @@
+clear lock
+clear control
+add control = Caps_Lock Control_L Control_R
+keycode 66 = Control_L Caps_Lock NoSymbol NoSymbol
diff --git a/linux/arch/readme.md b/linux/arch/readme.md
new file mode 100644
index 0000000..2b10a9b
--- /dev/null
+++ b/linux/arch/readme.md
@@ -0,0 +1,4 @@
+Arch linux configs
+
+* `config` -> map contents to `~/.config`.
+* `home` -> map contents to `~/`.
diff --git a/notes/setup.md b/notes/setup.md
index 22395a5..9f9bd2a 100644
--- a/notes/setup.md
+++ b/notes/setup.md
@@ -43,7 +43,15 @@
   </fontconfig>
   ```
 
-* map caps key to left-ctrl (see https://wiki.archlinux.org/index.php/Map_scancodes_to_keycodes for details)
+## Map caps to left-ctrl
+
+* Most promising method
+
+  * Install `xorg-xmodmap`
+  * Map `linux/home/Xmodmap` to ~/
+  * The above taken from https://wiki.archlinux.org/index.php/xmodmap
+
+* Second method: map caps key to left-ctrl (see https://wiki.archlinux.org/index.php/Map_scancodes_to_keycodes for details)
   * edit `/etc/udev/hwdb.d/10-my-modifiers.hwdb`
   * add:
 
@@ -54,6 +62,7 @@
 
   * run `udevadm hwdb --update` then reboot
 
+
 # Setting up Ruby
 
 * Install rvm