I am using bibtex and natbib for a scrartcl and the editor texmaker and everything works fine, except that I don't have auto-completion for (only) the command `\citet`. For `\citep` it works just fine. And both citation commands also do work. It's just a question of convenience for me.
How do I get auto-completion to work here?
Here's the tex file code (text reduced to a minimum):

```
\documentclass[a4paper, 12pt]{scrartcl}
\usepackage{fancyhdr}
\pagestyle{headings}

\usepackage{natbib}
\bibpunct{(}{)}{;}{a}{,}{,~}

\usepackage[english]{babel}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\newcommand{\changefont}[3]{\fontfamily{#1} \fontseries{#2} \fontshape{#3} \selectfont}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}

\usepackage{blindtext}

%----------------end-of-preamble----------------
%---------------begin-of-document---------------

\begin{document}

\section{Local Density Estimator}
Considering only equal-mass stars, \citet{vonhoerner1963} defined the local mean density around a star as ...

\bibliographystyle{plainnat}
\bibliography{/home/hmm/bib/clusters}

\end{document}

```