I've over 500 reputation on stackoverflow.com , and I joined meta.stackoverflow .
I got +100 reputation for association bonus.
When I ask question in meta.stackoverflow , if my question has up-voted , i got some reputation for meta.stackoverflow .

But now , I join to writers.stackexchange and then meta.writers.stackexchange .
I asked question for documentation? on meta.writers.stackexchange , I got some up-voted , but the reputation for meta.writers.stackexchange has not changed ? I don't know why and I want to know how reputation associates for main site (for example : stackoverflow.com ) and meta site ( for example : meta.stackoverflow.com ) ?