# Create your own content file¶

Now that you’ve seen a few sample content files, and built a simple book, try creating your own!

In the folder with all of your sample book contents, create a new file called mymarkdownfile.md. Put the following content in it:

# Here's my sample title

This is some sample text.

(section-label)=
## Here's my first section

Here is a [reference to the intro](intro.md). Here is a reference to [](section-label).


We’ve added two new pieces of markdown syntax, both of them are related to cross-references.

• (section-label)= is a label that’s attached to a section header. It refers to whatever header follows, and allows you to refer to this label later on in your text.

• [link text](link-target) syntax is how you specify a link in markdown. Here we’ve linked to another page, as well as to the label we created above.

When you build your book, you’ll see how these links resolve in the output.

Now that you’ve got a new file, we need to add it to your _toc.yml file so that Jupyter Book knows where it fits with your book’s structure. Add the a line to your _toc.yml file pointing to this new content, it should look something like this:

# In _toc.yml
format: jb-book
root: intro
chapters:
- file: markdown
- file: notebooks
- file: markdown-notebooks
- file: mymarkdownfile


Now that you’ve added the file to your _toc.yml file, you can re-run the build command:
\$ jupyter-book build mybookname