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If there is tag 1.1 for master branch in github, I want to create a pull request with some commits that only apply to that very tag. Is this possible?

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A tag is a named reference to a commit that cannot be moved (without deleting and re-tagging). A branch is a reference to a commit that can be moved forward to track development. So while you can make a local branch off a tagged commit, you can't push a commit to a tag--you have to make a PR to merge into another branch.

You could create a branch in your remote named something like 1.1-backfix off the 1.1 tag, and create a PR to merge into 1.1-backfix. You could delete and re-tag the new commit as 1.1 (although I wouldn't recommend it). You should probably tag the merge commit as 1.1.1 or some distinct version number when it's released so it can be distinguished from 1.1

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    Both tags and branches are just labels attached to a commit. The difference is that tags are used to refer to a specific version and are expected to never change, whereas branches are floating labels that always point to the most recent commit of a development effort. The only way to move a tag is to delete and then re-create it, and should only be done if a tag was created mistakenly. It is quite sensible that GitHub only allows PRs on branches. – amon Jul 20 '17 at 20:53
  • By the way, I really enjoy your answers here on Software Engineering :) – amon Jul 20 '17 at 20:56
  • Cheers mate! I've updated my answer using some of your better explanation. – Samuel Jul 20 '17 at 21:08

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