Documenting new features and bug fixes

When adding a new feature or fixing a bug, it is much appreciated to document what you did in a few lines or less in vX.Y.Z.txt where X, Y, Z form the current development version of pandas, as well as in the file release.rst both of which are located in pandas/doc/source. At the end of the blurb you've just added it is also encouraged to refer to the set of GitHub issue numbers/pull requests that are related to your contribution. When you want to refer to an issue or a pull request you can do it like so: :issue:`12345` where 12345 is the issue/pull request number.