Perhaps some quotes about forum rules would be useful. For example:
Spam is something that either is breaking the rules in stickies in various subforums or is overall low quality, off-topic or intended to advertise.
Ban evasion is not allowed. If it becomes known that someone who was banned created a new account, then they'll be banned again
Anything that'd get you expelled from a university for plagiarism will get you permabanned from this forum, regardless of your rank.
Or anything from
unofficial FAQ.
Also there could be some extra facts from forum history or some notes about
terminology.