> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://authorea.crisp.help/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# How do I include a LaTeX package?

Authorea features [LaTeXML](http://dlmf.nist.gov/LaTeXML/), the most powerful way to render LaTeX notation on the web.  [This](https://github.com/Authorea/LaTeXML/tree/master/lib/LaTeXML/Package) is an up to date list of all latex packages you can use on Authorea.

In order to use a specific LaTeX package, you need to include it, so that Authorea loads it for you. 

To do this follow these steps:

1. In your document toolbar, click on the cogs (⚙️) in the right end, and select **Edit Macros**.
2. If the package you want to add is for example `siunitx`, add this line in the macros file:
```\usepackage{siunitx}```  
3. Save and go back to the Document view where you can now type in a LaTeX block, for example, `\si{\meter}`  which will render as _m_.