MRG is a tag for a PR title, ENH for a commit.
But yeah, it would be good to add them there.

@amueller where exactly do you think this should go?

At the end of the contribution guide. http://scikit-learn.org/dev/developers/contributing.html

Thanks! I'll do that. Actually @ogrisel I'm also working on adding #6167 in the same section. I'll add this below that and continue work in that branch only so that further problems don't arise later. Is it fine? Sorry for bothering you with another PR....

@dsquareindia did you open a PR for this issue?

i think he was working on #6176 and was planning to put that in there (according to #6211 (comment)), but i got busy with gsoc since i last offered to take it up. i sorta forgot about it, but if this is something we want i could try wrapping it up again

Hey sorry @amueller I didn't quite get around to working on this. #6411 did solve this to some extent though. #6176 seems pretty outdated now imho. Is it still needed?

imo the rebasing part is still quite useful, squashing not as much now that github lets you squash and commit.

done in #7636. A link to a good rebasing doc was added in #7541. Closing this and #6176.