diff --git a/site/docs/extras.md b/site/docs/extras.md
index d95a080b..34487fe7 100644
--- a/site/docs/extras.md
+++ b/site/docs/extras.md
@@ -9,82 +9,10 @@ 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.
 
-## LaTeX Support
+## Math Support
 
-Maruku comes with optional support for LaTeX to PNG rendering via blahtex
-(Version 0.6) which must be in your `$PATH` along with `dvips`.
+Kramdown comes with optional support for LaTeX to PNG rendering via [MathJax](http://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.
 
 ## Alternative Markdown Processors
 
-While Jekyll defaults to using Maruku for Markdown conversion, you may use one
-of the other three pre-defined markdown parsers or define your own.
-
-### RDiscount
-
-If you prefer to use [RDiscount](https://github.com/rtomayko/rdiscount) instead
-of [Maruku](https://github.com/bhollis/maruku) for Markdown, just make sure you have
-it installed:
-
-{% highlight bash %}
-$ [sudo] gem install rdiscount
-{% endhighlight %}
-
-And then specify RDiscount as the Markdown engine in your `_config.yml` file to
-have Jekyll run with that option.
-
-{% highlight yaml %}
-# In _config.yml
-markdown: rdiscount
-{% endhighlight %}
-
-### Kramdown
-
-You can also use [Kramdown](http://kramdown.gettalong.org/) instead of Maruku
-for Markdown. Make sure that Kramdown is installed:
-
-{% highlight bash %}
-$ [sudo] gem install kramdown
-{% endhighlight %}
-
-Then you can specify Kramdown as the Markdown engine in `_config.yml`.
-
-{% highlight yaml %}
-# In _config.yml
-markdown: kramdown
-{% endhighlight %}
-
-Kramdown has various options for customizing the HTML output. The
-[Configuration](/docs/configuration/) page lists the default options used by
-Jekyll. A complete list of options is also available on the [Kramdown
-website](http://kramdown.gettalong.org/options.html).
-
-### User-Defined
-
-So, you're totally at odds with our four built-in markdown parsers, eh? No
-sweat. You can define one as a plugin:
-
-{% highlight ruby %}
-require 'jekyll'
-require 'some_renderer'
-
-class Jekyll::Converters::Markdown::MyCustomParser
-  def initialize(config)
-    @site_config = config
-  end
-
-  def convert(content)
-    # (this _must_ return the resulting String after the rendering)
-    SomeRenderer.new(@site_config).to_html(content)
-  end
-end
-{% endhighlight %}
-
-Once you've got that setup, ask Jekyll to use your custom markdown parser in
-your `_config.yml` file:
-
-{% highlight yaml %}
-markdown: MyCustomParser
-{% endhighlight %}
-
-(Note that this **is case-sensitive**, and is only the piece after
-`Jekyll::Converters::Markdown`.) And there you are!
+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](http://jekyll.dev/docs/configuration/#custom-markdown-processors).