a

README.md

@@ -24,6 +24,31 @@ You need:
 - your disks partitioned and mounted
 - this repo _(`git@tangled.sh:kris.darkworld.download/nix`)_
 
+## Build a custom installer ISO
+
+This flake now exposes an installer image with extra install tools preloaded
+(`git`, `disko`, partitioning and filesystem tools).
+
+Build it from this repo:
+
+```bash
+nix build .#installerIso
+```
+
+The ISO is created at:
+
+```text
+./result/iso/*.iso
+```
+
+Write it to a USB stick (replace `/dev/sdX`):
+
+```bash
+sudo dd if=./result/iso/*.iso of=/dev/sdX bs=4M status=progress oflag=sync
+```
+
+Then boot from that USB and follow the install steps below.
+
 ## Disk Layout
 
 This repo now uses `disko` for the default desktop host.