diff --git a/plugins/proxmox/proxmox_vm_count b/plugins/proxmox/proxmox_vm_count
index 47238f07..9f880293 100644
--- a/plugins/proxmox/proxmox_vm_count
+++ b/plugins/proxmox/proxmox_vm_count
@@ -18,7 +18,9 @@ This plugin needs to run as the root user in order to have permission to run lvs
 =back
 
 =head1 LICENSE
-Unknown license
+GPLv3 or later
+
+SPDX-License-Identifier: GPL-3.0-or-later
 
 =head1 MAGIC MARKERS
 =begin comment