diff --git a/hosts/pi/README.md b/hosts/pi/README.md
index 84e2bf2..1d3b579 100644
--- a/hosts/pi/README.md
+++ b/hosts/pi/README.md
@@ -16,3 +16,10 @@ SD card | `/dev/mmcblk0` (ext4, NixOS Root)
 ### Networks
 - DHCP on `10.0.1.0/24` subnet.
 - Tailscale on `100.64.0.0/10` subnet. FQDN: `pi.mesh.vimium.net`.
+
+## Devices and connections
+
+- SONOFF Zigbee 3.0 USB Dongle Plus (connected to USB 2.0 port to avoid [interference](https://www.unit3compliance.co.uk/2-4ghz-intra-system-or-self-platform-interference-demonstration/))
+- HDMI to ONKYO HT-R990
+- S/PDIF to ONKYO HT-R990
+- Ethernet to ONKYO HT-R990