School of the Osage » Wiki

You can use up to five different levels of headlines to structure your content. If you have more than three headlines, a table of contents is generated automatically – this can be disabled by including the string ~~NOTOC~~ in the document.

==== Headline Level 3 ====
=== Headline Level 4 ===
== Headline Level 5 ==

By using four or more dashes, you can make a horizontal line: