I believe this is encouraged, but I'd just like an explicit permission.
Suppose my answer is highly voted, and therefore quite prominent on top by that sorting criteria. Say later another person wrote an answer that is superior, but for one reason or another (maybe because it's written past the short initial vote rush period), doesn't get enough upvotes.
Should I just turn the other way and let whatever happens happens, or should I take responsibility for my own highly voted answer by improving it, incorporating the information from the superior but less voted answer?
I can see arguments for going either way, which is why I'm having doubts. In one hand we want the best most complete most correct answer to be easily found (and having high votes give you that visibility, and therefore responsibility to keep up with higher standards). However, it also seems terribly unfair to the up-and-coming answers if whatever new thing they bring to the table is quickly absorbed by the already "established" answer.