The traillink directive is supplied by the trail plugin. It generates a visible WikiLink, and also adds the linked page to the trail represented by the page containing the directive.

In its simplest form, the first parameter is like the content of a WikiLink:

[[!traillink  some_other_page]]

The displayed text can also be overridden, either with a | symbol or with a text parameter:

[[!traillink  Click_here_to_start_the_trail|some_other_page]]
[[!traillink  some_other_page text="Click here to start the trail"]]