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+# How to contribute
+
+Contributions are always very much appreciated. However, to make sure the
+process of accepting patches goes smoothly for everyone (especially for
+the maintainer), you should try to follow these few simple guidelines when
+you contribute:
+
+1. Fork the repository.
+2. Create a new branch based on the `develop` branch (`git checkout -b your_branch develop`).
+   If your contribution is a bug fix, you should name your branch `bugfix/xxx`;
+   for a feature, it should be `feature/xxx`. Otherwise, just use your good
+   judgment. Consistent naming of branches is appreciated since it makes the
+   output of `git branch` easier to understand with a single glance.
+3. Do your modifications on that branch. Except for special cases, your
+   contribution should include proper unit tests and documentation. Also,
+   please try to follow the style guide below.
+4. Make sure your modifications did not break anything by building and
+   running the tests:
+
+   ```shell
+   mkdir build
+   cd build
+   cmake ..
+   cmake --build . --target check
+   ```
+5. Commit your changes. Your commit message should start with a one line
+   short description of the modifications, with the details and explanations
+   of your modifications following in subsequent paragraphs or bullet points.
+   Please limit your lines to about 78 characters in commit messages, since
+   it makes the output easier to read in `git log`. Also, starting your commit
+   message with a tag describing the nature of the commit is nice, since it
+   makes the commit history easier to skim through. For commits that do not
+   change any functionality (e.g. refactoring or fixing typos), the `[NFC]`
+   tag (No Functionality Change) can be used. Here's an example of an
+   acceptable commit message:
+   ```
+   [Searchable] Refactor the interface
+
+   - Rename elem to contains
+   - Rename subset to is_subset, and make is_subset applicable in infix notation
+   - Add the at_key method
+   - operator[] is now bound to at_key instead of find
+   ```
+   When applicable, please squash adjacent _wip_ commits into a single
+   _logical_ commit. If your contribution has several logical commits,
+   it's fine.
+6. Push the changes to your fork (`git push origin your_branch`).
+7. Open a pull request against Hana's `develop` branch (not against `master`).
+   I will do my best to respond in a timely manner. I might discuss your patch
+   and suggest some modifications, or I might amend your patch myself and ask
+   you for feedback. You will always be given proper credit.
+
+
+## Style guide
+
+I'm not going to write an exhaustive style guide, but here are a couple of
+points you should watch out for:
+- Indent using 4 spaces.
+- Do not leave trailing white spaces at the end of lines, and no more than a
+  single newline at the end of a source file.
+- Hana's `#include`s go first, then a blank line and system headers.
+  `#include`s within each block should be sorted in alphabetical order.
+- Use your own judgment and stick to the style of the surrounding code.