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@@ -2,6 +2,23 @@
 
 Random notes and things to know useful for maintainers and contributors.
 
+## Definition of Done for the code changes
+
+Each change to the production code (bugfixes, new features, improvements) must include these elements. They must be present in the pull request BEFORE requesting the code review.
+
+- changes to the production code
+  - including changes to all supported language packs in `src/i18n/languages` directory (if applicable)
+- automatic tests
+  - for bugfixes: at least one test reproducing the bug
+  - for new features: a set of tests describing the feature specification precisely
+  - pull requests from external contributors should include tests in `tests/` directory (they will be moved to the private repository by the internal team)
+  - internal team adds tests directly to the private repository (through a separate pull request)
+- updates to documentation related to the change
+  - for breaking changes: a section in the migration guide
+- technical documentation in the form of the jsdoc comments (high-level description of the concepts used in the more complex code fragments)
+- changelog entry
+- pull request description
+
 ## Sources of the function translations
 
 HF supports internationalization and provides the localized function names for all built-in languages. When looking for the valid translations for the new functions, try these sources: