When contributor only has @webkit.org address, have multiple email address from different corporations (e.g. @apple.com and @google.com), the person's affiliation may not be obvious. In such case, it'll be helpful for him/her to manually override his/her affiliation in committers.py
Okay, Eric suggests that we don't add this feature for now and let contributors add an email address of their preference if needed.
Seems OK. I might make more sense to store this separately from commiters.py in some sort of teams.py which is a map from emails to team, or just a function which passed a Contributor figures out what affiliation(s)? they have.