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# Managing Documentation
Documentation is hard. It's difficult to write, difficult to find and always out
of date. That's why we implemented our in-tree documentation system that
underpins firefox-source-docs.mozilla.org. The documentation lives next to the
code that it documents, so it can be updated within the same commit that makes
the underlying changes.
This documentation is generated via the
[Sphinx](http://sphinx-doc.org/) tool from sources in the tree.
To build the documentation, run `mach doc`. Run
`mach help doc` to see configurable options.
The review group in Phabricator is `#firefox-source-docs-reviewers`.
For simple documentation changes, reviews are not required.
```{toctree}
:caption: Documentation
:glob: true
:maxdepth: 2
*
```