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, default values will be used which may look ugly.
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 this file looks like:
```md
---
title = "Front Matter"
---
Each `.md` file can optionally contain a header with metadata describing the document. If the header isn't present, default values will be used which may look ugly.
```
## 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