Closes #2118

According to decision at meeting.

chapters/operatorsandexpressions.tex

@@ -1125,9 +1125,10 @@ \subsection{Event-Related Operators with Function Syntax}\doublelabel{event-rela
 
 % sample
 \lstinline!sample(start, interval)! & Returns \lstinline!true! and triggers time events at time
-instants \lstinline!start + i*interval (i=0,1,...)!. During continuous integration
-the operator returns always \lstinline!false!. The starting time \lstinline!start! and the
-sample interval \lstinline!interval! need to be parameter expressions and need to be
+instants \lstinline!start + i*interval (i=0,1,...)!, and is only true during the first event iteration at those times.
+At event iterations after the first one at each event and during continuous integration 
+the operator returns always \lstinline!false!. The starting time \lstinline!start! and the 
+sample interval \lstinline!interval! must be parameter expressions and need to be 
 a subtype of Real or Integer. The sample interval \lstinline!interval! must be a
 positive number.\\ \hline