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---
title: Extras
permalink: /docs/extras/
---
There are a number of (optional) extra features that Jekyll supports that you
may want to install, depending on how you plan to use Jekyll.
## Web Highlights and Commenting
Register your site with [txtpen](https://txtpen.com). Then append
```html
<script src="https://txtpen.com/embed.js?site=<your site name>"></script>
```
to your template files in `/_layout` folder.
## Math Support
Kramdown comes with optional support for LaTeX to PNG rendering via [MathJax](https://www.mathjax.org) within math blocks. See the Kramdown documentation on [math blocks](http://kramdown.gettalong.org/syntax.html#math-blocks) and [math support](http://kramdown.gettalong.org/converter/html.html#math-support) for more details. MathJax requires you to include JavaScript or CSS to render the LaTeX, e.g.
```html
<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-AMS-MML_HTMLorMML" type="text/javascript"></script>
```
For more information about getting started, check out [this excellent blog post](http://gastonsanchez.com/visually-enforced/opinion/2014/02/16/Mathjax-with-jekyll/).
## Alternative Markdown Processors
See the Markdown section on the [configuration page](/docs/configuration/#markdown-options) for instructions on how to use and configure alternative Markdown processors, as well as how to create [custom processors](/docs/configuration/#custom-markdown-processors).
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