mkswap: add a note that -p is uncecessary

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/disk-utils/mkswap.8 b/disk-utils/mkswap.8
index cdb2a442efafe7448ea3dce6f0422f6cde144d8e..cab1a6e269c50bcdd28bddcc6f92cac899bd6d1c 100644 (file)
--- a/disk-utils/mkswap.8
+++ b/disk-utils/mkswap.8
@@ -91,7 +91,9 @@ will refuse to erase the first block on a device with a partition table or on
 whole disk (e.g. /dec/sda).
 .TP
 .BI \-p \ PSZ
-Specify the page size to use.
+Specify the page size in bytes to use. This option is usually unnecessary,
+.B mkswap
+reads the size from kernel.
 .TP
 .BI \-L \ label
 Specify a label, to allow swapon by label.