What's the right etiquette on Stack Overflow: Let's say someone adds an answer that has information addressing an answer I had posted to the same question previously. Then in the interest of having a better, self-sufficient answer do I modify my original (with credit to other poster)? Specifically, say if it's an equation that might do better with an extra term, or an assumption or a constraint I had failed to mention in my answer but in hindsight makes perfect sense.
Or do I leave readers to parse all answers, comments etc. to get the exact message by themselves. Would modifying my answer (to make it better / self sufficient / stand alone) based on another users later post be plagiarism?