The phrase "fair warning" means giving someone a clear and honest notice in advance about something that might happen, usually to prevent any surprises or misunderstandings. Full definition
Thus, if we were only looking from this point forward then this could arguably be characterized as fair warning on the future use of a corporation in the launch of a new business. (canadianbusiness.com)
Fair warning for those who fall into this dating of skeptics These absolutely adorable and absolutely true online dating success stories will story change your mind. (petesgrillandpizza.com)
It's just fair warning that dying is an integral part of how you play the game. (roadtovr.com)