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mkbook/docs-src/03-frontmatter.md

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---
title = "Front Matter"
---
Each `.md` file can optionally contain a header with metadata describing the document. If the header isn't present, or if any keys are missing, default values will be used.
To insert a header into a `.md` file, insert three dashes (`---`), followed by a new-line, followed by the front matter contents, followed by a newline, then another three dashes and a new-line. The metadata is in the [TOML](https://github.com/toml-lang/toml) format, so for example the front-matter (and first line) for a file could look like this:
```md
---
title = "Front Matter"
author = "Kenton Hamaluik"
pubdate = 2019-11-29T15:22:00-07:00
---
Each `.md` file can optionally contain a header with metadata describing the document. If the header isn't present, or if any keys are missing, default values will be used.
```
# Supported Keys
The list of supported keys is subject to change, but for now it is as follows:
title
: A human-readable title for the document (defaults to the filename)
author
: The author (or authors) who wrote the chapter (defaults to "Anonymous")
pubdate
: The [RFC 3339](http://tools.ietf.org/html/rfc3339) timestamp of when the chapter was published (defaults to the time at build)
url
: The relative URL of the file, defaults to the generated route (you probably shouldn't set this one)