Update chapters/synchronous.tex

Co-authored-by: Henrik Tidefelt <henrikt@wolfram.com>

chapters/synchronous.tex

@@ -1135,7 +1135,14 @@ \subsection{Clocked and Discretized Partitions}\label{clocked-discrete-time-and-
 Previously, clocked partition was refered to as \emph{clocked discrete-time partition}, and discretized partition as \emph{clocked discretized continuous-time partition}.
 \end{nonnormative}
 
-If a partition that is not continuous-time contains no operator \lstinline!der!, \lstinline!delay!, \lstinline!spatialDistribution!, no event related operators from \cref{event-related-operators-with-function-syntax} (with exception of \lstinline!noEvent! and \lstinline!smooth!), and no \lstinline!when!-clause with a \lstinline!Boolean! condition, it is a \firstuse[clocked!partition]{clocked}\index{partition!clocked} partition.
+If a partition that is not continuous-time contains any of the operators \lstinline!der!, \lstinline!delay!, \lstinline!spatialDistribution!, or event related operators from \cref{event-related-operators-with-function-syntax} (with exception of \lstinline!noEvent! and \lstinline!smooth!), or contains a \lstinline!when!-clause with a \lstinline!Boolean! condition, it is a \firstuse[discretized!partition]{discretized}\index{partition!discretized} partition.
+Otherwise, it is a \firstuse[clocked!partition]{clocked}\index{partition!clocked} partition.
+
+\begin{nonnormative}
+That is, a clocked partition is a standard sampled data system described by difference equations.
+\end{nonnormative}
+
+A discretized partition has to be solved with a \emph{solver method} of \cref{solver-methods}.
 
 \begin{nonnormative}
 That is, the clocked partition is a standard sampled data system that is described by difference equations.