Automatic tags?

I uploaded a file which i tagged "bikini" but when i checked it a minute later it also had the tag "swimsuit". This tag was, according to history, also added by ME O_o

Same thing happened with another pic that i had tagged "miko". When i checked it after uploading it had the tag "japanese clothing"(or something like that).

Because the "bikini" tag has a implication with the "swimsuit" tag.
So basically yes, is automatic.

You can see the current list of implications here: http://danbooru.donmai.us/tag_implication

Ones with a green background are pending approval from albert.