Sometimes it takes time to write a (hopefully) good answer: you have to search for references, for the exact wording of rules on manuals, looking for the description of a particular magic item, etc.
It happens to me that while I am writing my answer, someone else answers the question, coming up with very similar ideas and/or interpretation as mine and so on. I realize this only once my own answer is published: usually I decide to edit my own answer and cite the other ones, for sake of completeness, maybe commenting about them or adding other details.
I am wondering if this is good practice, or if is it better to leave my answer as it is without referring to other answers.