diff --git a/proxmox/vzdump-hook-lxc-buster-template.pl b/proxmox/vzdump-hook-lxc-buster-template.pl
index 5c2e53b..a52db91 100755
--- a/proxmox/vzdump-hook-lxc-buster-template.pl
+++ b/proxmox/vzdump-hook-lxc-buster-template.pl
@@ -48,6 +48,8 @@ if ($phase eq 'job-start' ||
 	my $hostname = $ENV{HOSTNAME};
 
 	# tarfile is only available in phase 'backup-end'
+	## TODO: TARFILE is deprecated in Proxmox 6 and was removed in Proxmox 7. Need to replace with TARGET.
+	## See "Breaking Changes" for Proxmox 7 : https://pve.proxmox.com/wiki/Roadmap#Proxmox_VE_7.0
 	my $tarfile = $ENV{TARFILE};
 
 	# logfile is only available in phase 'log-end'