> For the complete documentation index, see [llms.txt](https://counterfactual.gitbook.io/specs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://counterfactual.gitbook.io/specs/source/contributing.md).

# Contributing

HTML files are built automatically by readthedocs. To build a local preview copy, a Makefile is provided that invokes sphinx. Install the dependencies and build a local preview by doing the following:

```
python3 -m venv venv
source venv/bin/activate
pip3 install -r requirements.txt
make html
```