Add crossreference

chapters/functions.tex

@@ -117,7 +117,7 @@ \subsection{Inheritance of Functions}\label{inheritance-of-functions}
 \end{nonnormative}
 
 A special case is defining a \lstinline!function! as a short-class definition with modifiers for inputs inside a model.
-These default values, unless overridden in the function call, will then be considered for variability similarly as if they were given in the function call.
+These default values, unless overridden in the function call, will then be considered for variability similarly as if they were given in the function call, see \cref{function-variability}.
 
 \begin{example}
 Demonstrating the variability implications.