Signed-off-by: Meina Li <meili@redhat.com>
---
 docs/formatdomain.html.in | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index f3a639b972..394eab2897 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -4092,7 +4092,8 @@
         contents should be reverted automatically when the guest
         exits.  With some hypervisors, marking a disk transient
         prevents the domain from participating in migration or
-        snapshots. <span class="since">Since 0.9.5</span>
+        snapshots. Some hypervisors don't support this feature,
+        such as Xen, QEMU and OpenVZ. <span class="since">Since 0.9.5</span>

       </dd>
       <dt><code>serial</code></dt>
       <dd>If present, this specify serial number of virtual hard drive.
--
2.27.0