qemu-nbd: document -v behavior in respect to --fork in man

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Eric Blake <eblake@redhat.com>
CC: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Message-ID: <20230906093210.339585-8-den@openvz.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: Wording improvement]
Signed-off-by: Eric Blake <eblake@redhat.com>

diff --git a/docs/tools/qemu-nbd.rst b/docs/tools/qemu-nbd.rst
index faf6349ea51e03997803e0ad9340e290ca3dd46e..329f44d98957133d7fd6fadb3c93c900423a81f2 100644 (file)
--- a/docs/tools/qemu-nbd.rst
+++ b/docs/tools/qemu-nbd.rst
@@ -197,7 +197,9 @@ driver options if :option:`--image-opts` is specified.
 
 .. option:: -v, --verbose
 
-  Display extra debugging information.
+  Display extra debugging information. This option also keeps the original
+  *STDERR* stream open if the ``qemu-nbd`` process is daemonized due to
+  other options like :option:`--fork` or :option:`-c`.
 
 .. option:: -h, --help