+`vmgenid`: `<UUID>` ('default =' `1 (autogenerated)`)::
+
+The VM generation ID (vmgenid) device exposes a 128-bit integer value identifier to the guest OS. This allows to notify the guest operating system when the virtual machine is executed with a different configuration (e.g. snapshot execution or creation from a template). The guest operating system notices the change, and is then able to react as appropriate by marking its copies of distributed databases as dirty, re-initializing its random number generator, etc.
+Note that auto-creation only works when done throug API/CLI create or update methods, but not when manually editing the config file.
+