erc-log-matches-types-alist

erc-log-matches-types-alist is a variable defined in `erc-match.el'.
Its value is

((keyword . "ERC Keywords"))

Documentation:
Alist telling ERC where to log which match types.
Valid match type keys are:
- keyword
- pal
- dangerous-host
- fool
- current-nick

The other element of each cons pair in this list is the buffer name to
use for the logged message.

You can customize this variable.