Loosing volume on error

OK. I got what is going on here. The second disk had been detected as filed while resync did not complete yet

ReadyNAS1:~# mdadm -Q --detail /dev/md2
/dev/md2:
Version : 1.2
Creation Time : Fri Aug 26 13:51:11 2011
Raid Level : raid5
Used Dev Size : -1
Raid Devices : 6
Total Devices : 5
Persistence : Superblock is persistent

Update Time : Fri Aug 26 22:11:26 2011
State : active, FAILED, Not Started
Active Devices : 4
Working Devices : 5
Failed Devices : 0
Spare Devices : 1

Layout : left-symmetric
Chunk Size : 64K

Name : 001F33EABA01:2
UUID : 01a26106:50b297a8:1d542f0a:5c9b74c6
Events : 83

Number Major Minor RaidDevice State
0 8 3 0 active sync /dev/sda3
1 8 19 1 active sync /dev/sdb3
2 8 35 2 active sync /dev/sdc3
3 0 0 3 removed
4 8 67 4 active sync /dev/sde3
5 8 83 5 spare rebuilding /dev/sdf3

What I need to get now I guess is to change that removed guy to "active sync" any idea how to do it ?