diff --git a/2025/xg-infra-upgrade-2025.md b/2025/xg-infra-upgrade-2025.md
index 0550964..b205acf 100644
--- a/2025/xg-infra-upgrade-2025.md
+++ b/2025/xg-infra-upgrade-2025.md
@@ -1,4 +1,11 @@
 * NAS clean install newest FreeBSD 14.2
+* Manage old zpool:
+	* (old OS) zfs export zpool
+	* (new OS) zfs import zpool
+	* zpool status
+	* zpool upgrade
+	* zpool upgrade zpool
+	* https://docs.freebsd.org/en/books/handbook/zfs/#zfs-zpool-upgrade
 * Syncthing shares on separated ZFS subvolumes
 * pyrotechnics & private data zfs copies=2?
 * Applications in VMs