[CentOS] raid10, centos 4.x

I just created a 4 drive mdadm --level=raid10 on a centos 4.8-ish system 
here, and shortly thereafter remembreed I hadn't updated it in a while, 
so i ran yum update...

while installing/updating stuff, got these errors:

      Installing: kernel                       ####################### 
[14/69]
    raid level raid10 (in /proc/mdstat) not recognized
    ...
      Installing: kernel-smp                   ####################### 
[19/69]
    raid level raid10 (in /proc/mdstat) not recognized


is this a problem?   the raid10 'seems' to work....