Kerberos authentication reference for ApacheDS 1.5.7

[Amila Jayasekara]

Hi All,
   I am planning to move from ApacheDS 1.5.5 to 1.5.7. Implementing 
Kerberos authentication is a primary requirement for me. So is there a 
good reference document on how to implement Kerberos in 1.5.7 ?

Thanks
AmilaJ