# Add a rule after chapter title using titlesec

I've been experimenting with chapter title formatting using titlesec but I can't seem to find the proper way to add a rule just below the chapter title. After reading the doc, I found that \titleline does that, but I'm not sure where in the \titleformat syntax to place it.

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Here's one possible solution using the last optional argument for \titleformat to insert some vertical spacing and the rule:

\documentclass{book}
\usepackage{titlesec}

\titleformat{\chapter}[display]
{\normalfont\huge\bfseries}{\chaptertitlename\ \thechapter}{20pt}{\Huge}[\vspace{2ex}\titlerule]

\begin{document}

\chapter{Test Chapter}

\end{document}

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Thanks for clearing that up! It works! –  Kpantzas Aug 29 '12 at 17:15