3 days before mission 'going to CCIE'

Do yo know ? why need put 'subnets' in redistribute to OSPF
May be in OSPFv1 just concern about classfull networks :D

Router(config-router)#redistribute rip metric 1 
% Only classful networks will be redistributed

Router(config-router)#redistribute rip metric 1 subnets

What about progress going to CCIE

my condition (last night)
- health 49% increase 59% before sleep
- spirit 89%

this morning
- health 75%

keep spirit, always battle ...
ganbatte kudasai