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Included in:

- user-manual
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A table of contents (TOC) is an index of section and subsection titles that can be automatically generated from the document's structure when converting a document with Asciidoctor.

To enable the auto-generated TOC, you must set the `toc` attribute.

The `toc` attribute can be specified via the command line (`-a toc`),

.TOC enabled via the CLI
----
$ asciidoctor -a toc adventure.adoc
----

or in the document header (`:toc:`).

.TOC enabled via the document header
[source]
----
include::toc.adoc[]
----

When no other options are specified, the TOC is inserted directly below the document header (document title, author, and revision lines), it has the title _Table of Contents_, and contains section 1 and section 2 level titles only.

.Result: Setting the toc attribute
====
image::toc.png[Default table of contents]
====

Asciidoctor allows you to customize the layout, placement, and title of the table of contents.
However, not all customizations are supported by all converters.
See the <<table-of-contents-summary>> to find out which customizations are available to each backend.