fancyhdr exmaple

gistfile1.tex

\pagestyle{fancy}                         % use fancyhdr for the following pages
\fancyhead{}                              % clear all header fields
\rhead{\rightmark}                        % section name for right side (header)
\renewcommand{\headrulewidth}{0.4pt}      % thickness of header ruler
\fancyfoot{}                              % clear all footer fields
\renewcommand{\headrulewidth}{0pt}        % no ruler for footer

%\chapter{Here goes your chapter}