diff --git a/man/gnt-cluster.rst b/man/gnt-cluster.rst
index bcba7ef49ee4c5a04bea57eec71de9043ef5808a..1f1705d1e1ed6fd0d8e6e88f261a58bf8b08f2e0 100644
--- a/man/gnt-cluster.rst
+++ b/man/gnt-cluster.rst
@@ -217,7 +217,11 @@ The ``--vg-name`` option will let you specify a volume group
 different than "xenvg" for Ganeti to use when creating instance
 disks. This volume group must have the same name on all nodes. Once
 the cluster is initialized this can be altered by using the
-**modify** command. If you don't want to use lvm storage at all use
+**modify** command. Note that if the volume group is modified after
+the cluster creation, the metavg will have to be manually modified
+accordingly.
+
+If you don't want to use lvm storage at all use
 the ``--no-lvm-storage`` option. Once the cluster is initialized
 you can change this setup with the **modify** command.