Add subtitle command

hhuthesis.cls

@@ -26,6 +26,9 @@
 \newcommand{\subject}[1]{\renewcommand{\@subject}{#1}}
 \newcommand{\@subject}{Informatik}
 
+\newcommand{\subtitle}[1]{\renewcommand{\@subtitle}{#1}}
+\newcommand{\@subtitle}{}
+
 %% Allows switching between colour and black/white printing
 \newif\ifprintblackwhite
 \printblackwhitefalse
@@ -279,6 +282,10 @@
   \vspace{3cm}
   \begin{center}
     {\fontfamily{\sfdefault}\selectfont \Huge \textbf \@title \par}%
+    \if\relax\detokenize{\@subtitle}\relax
+    \else
+      {\fontfamily{\sfdefault}\selectfont \huge \textbf \@subtitle \par}%
+    \fi%
     \vfill
     \begin{otherlanguage}{ngerman}
       {{\Large \@degree{}arbeit}\par

thesis.tex

@@ -24,6 +24,7 @@
 
 %% Der Titel der Arbeit
 \title{My Extraordinary Thesis}
+% \subtitle{Usually not needed}
 
 %% Der zu erreichende Abschluss, entweder Bachelor oder Master
 \graduationtype{Bachelor}