To see how you can create a "frontmatter" section in a Leanpub book, copy and paste the following into the first file in your book, at the very top of the file:

{frontmatter}

# Foreword

It was the best of times.

{mainmatter}

# Chapter One

It was the worst of times.

Here is an example of what this would look like in our in-browser text editor:

The next time you create a preview, you will see how this looks in the book. Here's the table of contents from the example book we created for this article:

The Foreword will be on a page of its own, like this:

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