Not sure, but would it make sense to have an alert set up that tells people who have posted answers if the question has been edited?

This post shows how edits can change the question, and there for invalidate answers:
[The revision history matters](https://meta.stackoverflow.com/questions/265345/the-revision-history-matters?cb=1)

Because of this, can the users who have posted an answer get an alert when the question is edited, so that they can check to see if the edit means they need to change their answer, or would this fill up the "inbox" of people who have posted lots of answers?

Sorry about wording, but not sure how I can make this clear.

Just to clarify, I don't mean to say that this would encourage bigger edits, but some edits change small parts of the question, like describing what the OP has already tried, which could invalidate an answer.