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+.. include:: ../.github/CONTRIBUTING.rst
+   :end-before: DO-NOT-REMOVE-deps-snippet-PLACEHOLDER
+
+Module dependency graph
+-----------------------
+
+Extra care should be taken when considering adding any dependency. Removing
+most dependencies on Ansible internals is desired as these can change
+without any warning.
+
+.. command-output:: pipdeptree -p ansible-lint
+
+.. include:: ../.github/CONTRIBUTING.rst
+   :start-after: DO-NOT-REMOVE-deps-snippet-PLACEHOLDER
+
+Adding a new rule
+-----------------
+
+Writing a new rule is as easy as adding a single new rule, one that combines
+**implementation, testing and documentation**.
+
+One good example is MetaTagValidRule_ which can easily be copied in order
+to create a new rule by following the steps below:
+
+* Use a short but clear class name, which must match the filename
+* Pick an unused ``id``, the first number is used to determine rule section.
+  Look at rules_ page and pick one that matches the best your new rule.
+  see which one fits best.
+* Include ``experimental`` tag. Any new rule must stay as
+  experimental for at least two weeks until this tag is removed in next major
+  release.
+* Update all class level variables.
+* Implement linting methods needed by your rule, these are those starting with
+  **match** prefix. Implement only those you need. For the moment you will need
+  to look at how similar rules were implemented to figure out what to do.
+* Update the tests. It must have at least one test and likely also a negative
+  match one.
+* If the rule is task specific, it may be best to include a test to verify its
+  use inside blocks as well.
+* Optionally run only the rule specific tests with a command like:
+  :command:`tox -e py38-ansible29 -- -k NewRule`
+* Run :command:`tox` in order to run all ansible-lint tests. Adding a new rule
+  can break some other tests. Update them if needed.
+* Run :command:`ansible-lint -L` and check that the rule description renders
+  correctly.
+* Build the docs using :command:`tox -e docs` and check that the new rule is
+  displayed correctly in them.
+
+.. _MetaTagValidRule: https://github.com/ansible/ansible-lint/blob/master/lib/ansiblelint/rules/MetaTagValidRule.py
+.. _rules: https://ansible-lint.readthedocs.io/en/latest/default_rules.html