with the latest mdadm

hi,
with the latest mdadm-2.3.1 we've got the following message:
-------------------------------------
md: md4: sync done.
RAID1 conf printout:
 --- wd:2 rd:2
 disk 0, wo:0, o:1, dev:sda2
 disk 1, wo:0, o:1, dev:sdb2
md: mdadm(pid 8003) used obsolete MD ioctl, upgrade your software to use
new ictls.
-------------------------------------
this is just a warning or some kind of problem with mdadm?
yours.

-- 
  Levente                               "Si vis pacem para bellum!"