btrfstune operates on umounted devices <device>,
not mount points <mnt>. fix it.
---
 man/btrfstune.8.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/man/btrfstune.8.in b/man/btrfstune.8.in
index d4b2b7c..0313324 100644
--- a/man/btrfstune.8.in
+++ b/man/btrfstune.8.in
@@ -2,7 +2,7 @@
 .SH NAME
 btrfstune \- tune various filesystem parameters.
 .SH SYNOPSIS
-.B btrfstune [\fIoptions\fP] \fI<mnt>\fP
+.B btrfstune [\fIoptions\fP] \fI<device>\fP
 .SH DESCRIPTION
 \fBbtrfstune\fP is used to tune various filesystem parameters,you can
 enable/disable some extended features for btrfs.
-- 
1.8.0.1

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