[PATCH] xfsprogs: mkfs manpage -nsize/log

[Wengang Wang]

Signed-off-by: Wengang Wang <wen.gang.wang at oracle.com>
---
 man/man8/mkfs.xfs.8 |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/man/man8/mkfs.xfs.8 b/man/man8/mkfs.xfs.8
index 4b147e9..bdaa153 100644
--- a/man/man8/mkfs.xfs.8
+++ b/man/man8/mkfs.xfs.8
@@ -478,6 +478,8 @@ in bytes with
 or as a base two logarithm
 .I value
 .RB "with " log= .
+The block size must be a power of 2 size and cannot be made less than the
+filesystem block size.
 The default size
 .I value
 for version 2 directories is 4096 bytes (4 KiB),
-- 
1.6.6.1