diff --git a/knowledge/software/metis.md b/knowledge/software/metis.md
index 6f7f66e..a6eaca0 100644
--- a/knowledge/software/metis.md
+++ b/knowledge/software/metis.md
@@ -53,3 +53,9 @@
 - titan-21: Ubuntu 20.04.6 LTS, kernel 5.10.104-tegra, CRI containerd://2.0.5-k3s2, arch arm64
 - titan-22: Debian 13 (trixie), kernel 6.12.41+deb13-amd64, CRI containerd://2.0.5-k3s2, arch amd64
 - titan-24: Debian 13 (trixie), kernel 6.12.57+deb13-amd64, CRI containerd://2.0.5-k3s2, arch amd64
+
+
+### External hosts
+- titan-db: Ubuntu 24.10, kernel 6.11.0-1015-raspi, root on /dev/sda2 ext4 (465G), boot vfat /dev/sda1; PostgreSQL service enabled.
+- titan-jh: Arch Linux ARM (rolling), kernel 6.18.4-2-rpi, NVMe root ext4 238G (/), boot vfat 512M; ~495 packages installed (pacman -Q).
+- titan-23/oceanus: TODO audit (future).