diff --git a/README.md b/README.md
index 00c15c0..521d425 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,47 @@
-# raspi-setup
+# Raspberry Pi Setup
 
-instructions for setting up a Raspberry Pi
\ No newline at end of file
+This is a quick guide to set up a Raspberry Pi for IO control shenanigans.
+
+Pick an SD card and write an image plus SSH config on your laptop.
+
+## Image
+
+<https://www.raspberrypi.com/software/operating-systems/>
+
+Raspberry OS Lite, possibly 64-bit for Pi 3 or later
+
+`unxz` the image, then `dd`; e.g.:
+
+```
+sudo dd status=progress \
+    if=2024-11-19-raspios-bookworm-armhf-lite.img \
+    of=/dev/mmcblk0
+```
+
+## SSH
+
+- copy .ssh dir; `cp -r ssh-dir rootfs/home/pi/.ssh`
+- `touch bootfs/ssh`
+
+## Interfaces
+
+This is done from the running system.
+
+- `raspi-config` -> `3 Interface Options`
+- configure as you need :)
+- reboot to apply (config is written to `/boot/cmdline.txt` /
+  `/boot/config.txt`)
+
+## Scripts
+
+Do your Python foo...
+
+## Services
+
+Example:
+
+<https://github.com/torfsen/python-systemd-tutorial/blob/master/python_demo_service.service>
+
+You probably need the type `exec` or `simple`:
+
+<https://www.freedesktop.org/software/systemd/man/latest/systemd.service.html>