[libvirt] [PATCH] docs: comments wiping supported algorithms

[Alex Jia <ajia redhat com>]

The current scrub version doesn't support pfitzner7, pfitzner33 and schneier patterns
on RHEL, we should comment it in virsh man page.

* tools/virsh.pod: update wiping algorithms docs.

Signed-off-by: Alex Jia <ajia redhat com>
---
 tools/virsh.pod |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/tools/virsh.pod b/tools/virsh.pod
index c306a38..eba9389 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -2081,6 +2081,8 @@ B<Supported algorithms>
   pfitzner33 - Roy Pfitzner's 33-random-pass method: random x33.
   random     - 1-pass pattern: random.
 
+B<Note>: Not all algorithms of wiping are expected to work, it depends on concrete B<srub> version. 
+
 =item B<vol-dumpxml> [I<--pool> I<pool-or-uuid>] I<vol-name-or-key-or-path>
 
 Output the volume information as an XML dump to stdout.
-- 
1.7.1