diff --git a/chapters/classes.tex b/chapters/classes.tex
index 25e7c2274..bef2d804d 100644
--- a/chapters/classes.tex
+++ b/chapters/classes.tex
@@ -729,7 +729,7 @@ \subsection{Short Class Definitions}\label{short-class-definitions}
 \end{lstlisting}
 \end{example}
 
-\subsection{Restriction on combining base classes and other elements}\label{restriction-on-combining-base-classes-and-other-elements}
+\subsection{Combining base classes and other elements}\label{restriction-on-combining-base-classes-and-other-elements}\label{combining-base-classes-and-other-elements}
 
 It is not legal to combine other components or base classes with an extends from an array class, a class with non-empty \lstinline[language=grammar]!base-prefix!, a \firstuse{simple type} (\lstinline!Real!, \lstinline!Boolean!, \lstinline!Integer!, \lstinline!String! and enumeration types), or any class transitively extending from an array class, a class with non-empty \lstinline[language=grammar]!base-prefix!, or a simple type.