diff --git a/doc/admin.rst b/doc/admin.rst
index 80028e6ec22cd6ac969bae8cb5b6f68000385b6b..d7f70f585d18d3e42ac431021523b5c4b46394d0 100644
--- a/doc/admin.rst
+++ b/doc/admin.rst
@@ -138,6 +138,10 @@ drbd
   to obtain a highly available instance that can be failed over to a
   remote node should the primary one fail.
 
+  .. note:: Ganeti does not support DRBD stacked devices:
+     DRBD stacked setup is not fully symmetric and as such it is
+     not working with live migration.
+
 rbd
   The instance will use Volumes inside a RADOS cluster as backend for its
   disks. It will access them using the RADOS block device (RBD).