diff --git a/configs/iso/airootfs/root/INSTALL.md b/configs/iso/airootfs/root/INSTALL.md
index e2b743f..2cfef33 100644
--- a/configs/iso/airootfs/root/INSTALL.md
+++ b/configs/iso/airootfs/root/INSTALL.md
@@ -1,10 +1,16 @@
-This document is extracted `Install` section from [README.md].
+This document is extracted `Manual Install to EFI system` section from [README.md].
 
 ---
 
+## Install
+
+### Manual Install to EFI system
+
+First, prepare Quilt bootable device, referring to [Example to create bootable device].
+
 1. Launch the ISO env
 2. In `ranger` interface, press `Shift s` key combi to enter the shell
-3. If necessary, perform [partitioning] using `cfdisk` or similar
+3. If necessary, perform [partitioning] using `cfdisk` or similar, referring to [Example to partitioning]
 4. Run the below
 
 ```bash
@@ -20,5 +26,29 @@ arch-chroot /mnt /bin/sh -c 'efi_dir=/boot && grub-install --efi-directory="$efi
 Finally, run `reboot`.
 Installation complete!
 
+## Misc
+
+### Example to create bootable device
+
+```bash
+echo label: gpt | sudo sfdisk --wipe always path/to/device
+sudo dd bs=100M if=path/to/iso of=path/to/device status=progress
+```
+
+- `path/to/device` is a device file (e.g. `/dev/sda`)
+
+### Partitioning Example
+
+```bash
+sfdisk path/to/device << /sfdisk
+label: gpt
+
+size=300MiB, type=U
+type=L
+/sfdisk
+```
+
+[Example to create bootable device]: #example-to-create-bootable-device
+[Partitioning Example]: #partitioning-example
 [README.md]: https://raw.githubusercontent.com/sakkke/quilt/main/README.md
 [partitioning]: https://wiki.archlinux.org/title/Partitioning