Board Thread:Questions and Answers/@comment-8961248-20130514155452/@comment-8961248-20130525174404

If it is a popular article in one of the categories, it will eventually emerge in the menu. Otherwise, if the page provides enough information, and is useful all-around, an admin may add it manually in the menu the next time they make changes to it.

Obviously, not all pages of the wiki can appear in the menu, so choices based on usefulness have to be made.