# The PreTeXt Guide

## Section29.5Index Style

Start at Section 3.22 to learn how to create an index. The realization of the index for online output is implemented within PreTeXt. We have made certain stylistic choices, in addition to taking advantage of certain features of the online format.
• A one-column format.
• A headnote can be accomplished with an <introduction>.
Also, there can be significant differences between how PreTeXt implements the index for HTML and how the imakeidx package creates an index for . See Section 30.15 and [2].