What is the general policy for completing an answer from an other user ? Should I prefer to start an other answer, just saying "As user:xxx said, blabbla, BUT I would like to add blabla..." or should I edit the previous answer, with the possibility to severely annoy its author ? After all, that's her/his answer... so is it well accepted to edit the others' answers ?

For instance, part of the answer should be wrong. Should I delete this part by myself, or make a comment to the author ? (I obviously prefer the second option, but the first one, if it become more accepted, could be time saving I believe).

For instance, an answer could be full of doubtful remarks like "I believe that $x=y$... ", but I know this is for sure. Should I edit the answer such that only "$x=y$" appears ?

I believe there are much more possibilities, I'm asking for your experience and knowledge about the edit of someone else's answer.


This has been asked multiple times on the main meta. In this case I'll just copy my answer over there.

  • If its just a bit of more info (read:a paragraph), add it and leave a comment.
  • If it's a completely new bundle of stuff, but is based on stuff gleaned from the answer, write an addendum answer as described above. Hat it with "This is in addition to @JonSkeet's answer". You may also comment on the original answer and ask the poster to incorporate your answer if s/he wishes--and then delete your answer once the deal is done (Something smilar could have happened here, though it didn't).


Factors affecting torque and RPM of a motor

How can one imagine curled up dimensions?

Penetration versus Frequency

Will an emf be induced across the ends of a stationary metal rod placed in a time-varying magnetic field?

In the case of wrong answers (or parts of answers), leave a comment. Try not to make radical changes in edits -- you can tell the OP in a comment to make them himself.

  • $\begingroup$ Thanks for your answer. I indeed forgot to check on the SO meta. Sorry for the repeat. Thanks again. $\endgroup$
    – FraSchelle
    Jun 13 '13 at 14:23
  • 2
    $\begingroup$ Even adding a paragraph to an existing answer is something I would consider a radical edit, if it didn't actually come from the OP. $\endgroup$
    – David Z
    Jun 13 '13 at 18:23

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