diff --git a/chapters/equations.tex b/chapters/equations.tex
index 4d02023cc..b343a8b01 100644
--- a/chapters/equations.tex
+++ b/chapters/equations.tex
@@ -59,6 +59,10 @@ \subsection{Simple Equality Equations}\label{simple-equality-equations}
 Also compare with \cref{assignments-from-called-functions-with-multiple-results} about calling functions with multiple outputs in assignment statements.
 \end{nonnormative}
 
+Note that there is also \lstinline!function_name(inexpr1, inexpr2);! which calls the given function or operator.
+It behaves similarly to a simple equation (calling the function or operator but ignoring any potential output), even if it uses a different production in the grammar.
+It is used for special operators like \lstinline!reinit! (\cref{reinit}), \lstinline!assert! (\cref{assert}), and \lstinline!terminate! (\cref{terminate}).
+
 
 \subsection{For-Equations -- Repetitive Equation Structures}\label{for-equations-repetitive-equation-structures}