diff --git a/README.md b/README.md
index d79aae3..c73800e 100644
--- a/README.md
+++ b/README.md
@@ -13,12 +13,12 @@ See also:
   * [Table of Contents](#table-of-contents)
   * [NixOS installation](#nixos-installation)
     * [Graphical installation](#graphical-installation)
-  * [Remote installation: disko and nixos-anywhere](#remote-installation-disko-and-nixos-anywhere)
-  * [ARM device: SD image for the Raspberry Pi 3B+](#arm-device-sd-image-for-the-raspberry-pi-3b)
-    * [ISO](#iso)
-    * [Default configuration](#default-configuration)
-    * [Apply modified configuration](#apply-modified-configuration)
-  * [ARM device: Vanilla UEFI bootloader for the Raspberry Pi 3B+](#arm-device-vanilla-uefi-bootloader-for-the-raspberry-pi-3b)
+    * [Remote installation: disko and nixos-anywhere](#remote-installation-disko-and-nixos-anywhere)
+    * [ARM: SD image for the Raspberry Pi 3B+](#arm-sd-image-for-the-raspberry-pi-3b)
+      * [ISO creation](#iso-creation)
+      * [Default configuration](#default-configuration)
+      * [Apply modified configuration](#apply-modified-configuration)
+    * [ARM: Vanilla UEFI bootloader for the Raspberry Pi 3B+](#arm-vanilla-uefi-bootloader-for-the-raspberry-pi-3b)
   * [Update, build and switch](#update-build-and-switch)
     * [Update](#update)
     * [Build and switch: Using Colmena](#build-and-switch-using-colmena)
@@ -54,15 +54,15 @@ During installation:
   * One 512MB (or larger) Fat32 partition, mounted at `/boot`, "boot" flag enabled
   * Another partition (e.g. BTRFS) covering the rest of the drive, mounted at `/`, encryption enabled
 
-## Remote installation: disko and nixos-anywhere
+### Remote installation: disko and nixos-anywhere
 
 Install NixOS via SSH everywhere.
 
 There is a separate repository for these steps. Its README can be found here: https://codeberg.org/privacy1st/nixos-anywhere-example/src/template/README.md
 
-## ARM device: SD image for the Raspberry Pi 3B+
+### ARM: SD image for the Raspberry Pi 3B+
 
-### ISO
+#### ISO creation
 
 If you are on an architecture other than aarch64, enable emulation: `boot.binfmt.emulatedSystems = [ "aarch64-linux" ];`.
 
@@ -81,13 +81,13 @@ ls result/sd-image/*.img
 
 Alternatively to emulating the aarch64 architecture we could also cross compile from e.g. x86 to it. However, this has one big drawback: The binary cache (https://cache.nixos.org/) won't be used. The reason for this is that packages built with cross compilation are (slightly) different from native built ones. Their checksums don't match.
 
-### Default configuration
+#### Default configuration
 
 When the Raspberry Pi is booted, run `nixos-generate-config` to generate the default `configuration.nix` and `hardware-configuration.nix` files.
 
-A slightly modified config can be found in [./hosts/pi3bplus/](./hosts/pi3bplus/)
+A slightly modified config can be found in [./hosts/pi3bplus](./hosts/pi3bplus)
 
-### Apply modified configuration
+#### Apply modified configuration
 
 The Rapberry Pi 3B+ has only 1GB RAM, which is not enough for `nixos-rebuild`. It is recommended to create and activate a SWAP file first: https://wiki.archlinux.org/title/swap#Swap_file_creation
 
@@ -106,7 +106,7 @@ nixos-rebuild boot
 reboot
 ```
 
-## ARM device: Vanilla UEFI bootloader for the Raspberry Pi 3B+
+### ARM: Vanilla UEFI bootloader for the Raspberry Pi 3B+
 
 **TODO**: The EFI menu was working. But I got many squashfs errors when booting an USB stick with the NixOS installer.