1\documentclass[a4paper, oneside, 10pt]{article}
2\usepackage[utf8x]{inputenc}
3\usepackage[czech]{babel}
4\usepackage{soul}
5\begin{document}
6
7\hl{FIXME}
8
9\hl{FIXME[AK](test case)}
10
11\end{document}
12