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+# Documentation Website Files and Assets
+
+This directory contains extra files for modifying the look and functionality of 
+[mdbook](https://github.com/rust-lang/mdBook), the documentation software that's
+used to generate Synapse's documentation website.
+
+The configuration options in the `output.html` section of [book.toml](../../book.toml)
+point to additional JS/CSS in this directory that are added on each page load. In
+addition, the `theme` directory contains files that overwrite their counterparts in
+each of the default themes included with mdbook.
+
+Currently we use these files to generate a floating Table of Contents page.
+The code for which was partially taken from
+[JorelAli/mdBook-pagetoc](https://github.com/JorelAli/mdBook-pagetoc/)
+before being modified such that it scrolls with the content of the page.
+
+More information can be found in mdbook's official documentation for
+[injecting page JS/CSS](https://rust-lang.github.io/mdBook/format/config.html)
+and
+[customising the default themes](https://rust-lang.github.io/mdBook/format/theme/index.html).
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