Warning: Altis v12 is no longer supported.

Custom Documentation

The documentation module can be used for your own custom modules, allowing you to build an internal knowledge base for your development team.

The built-in Documentation Set is intended for developer documentation. To add your documentation to the Developer Docs set, see the information below. To add additional sets of Documentation, perhaps for the users of your system, see Additional Documentation Sets.

Documentation Structure

Each module provides its own documentation. The Documentation module also includes project-level documentation, such as the Guides and Getting Started documentation.

The Documentation module automatically takes Markdown files from a docs/ directory within each module's root directory, and parses them into pages. These are hierarchically-structured based on the directory structure, with README.md acting as the index file for each directory.


Documentation files are standard Markdown, as supported by Parsedown. They also support relative and in-project links.

Markdown files can contain YAML front-matter, which specifies a list of "meta" information about the page itself. The following fields are supported:

# Title of the page for the menu.
# Default: first H1 on the page.
title: Page Title

# Order of the page within the menu.
# Pages with the same `order` value will be ordered by filename.
# Default: 0
order: 0

Headers have automatically generated fragment IDs attached for in-page linking. This automatic ID can be overridden if desired by suffixing with {#id-name}:

# Header Name {#override-id}

Custom Behavior

Internally, the Documentation module stores an ordered list of "groups", which have an ID and associated top-level pages. Each page has metadata, content, and potentially sub-pages.

The altis.documentation.groups filter is provided the ordered list of Group objects, and you can add or remove groups from here, or manipulate existing groups. The Documentation\add_docs_for_group() function may be useful for this; see Documentation\filter_add_dev_docs_set() to see how Altis generates developer documentation for modules.

For example, to add your own Guides-style section:

use Altis\Documentation\Group;
use function Altis\Documentation\add_docs_for_group;

add_filter( 'altis.documentation.groups', function ( array $groups, string $set_id ) {
	if ( $set_id === 'dev-docs' ) {
		$groups['project-guides'] = new Group( 'Project Guides' );
		add_docs_for_group( $groups['project-guides'], __DIR__ . '/our-guides' );
	return $groups;
} );