silent option description not correct.
---
utils/v4l2-ctl/v4l2-ctl.1.in | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/utils/v4l2-ctl/v4l2-ctl.1.in b/utils/v4l2-ctl/v4l2-ctl.1.in
index b8cbe6d2..107dd959 100644
--- a/utils/v4l2-ctl/v4l2-ctl.1.in
+++ b/utils/v4l2-ctl/v4l2-ctl.1.in
@@ -140,7 +140,20 @@ Set the new access priority [VIDIOC_S_PRIORITY].
\fI<prio>\fR is 1 (background), 2 (interactive) or 3 (record).
.TP
\fB--silent\fR
-Only set the result code, do not print any messages.
+
+If operating system doesn't return error while v4l2-ctl try to read or
write any multimedia device parameter then --silent option is no matter.
+If operating system return error while v4l2-ctl try to read or write
any multimedia device parameter then --silent option is important.
+For example there isn't /dev/video1 in system.
+If you don't use --silent option you will get both error message and
error result code
+$ v4l2-ctl --device /dev/video1 --set-parm 25
+VIDIOC_S_PARM: failed: Inappropriate ioctl for device
+$ echo $? # get result code
+255
+
+If you use --silent option you willn't get error message. But you still
can get error result code
+$ v4l2-ctl --device /dev/video1 --set-parm 25 --silent
+$ echo $? # get result code
+255
.TP
\fB--sleep\fR \fI<secs>\fR
Sleep \fI<secs>\fR, call QUERYCAP and close the file handle.
--
2.34.1
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