diff --git a/source/classes.tex b/source/classes.tex
index a754160838..f907f2d5b9 100644
--- a/source/classes.tex
+++ b/source/classes.tex
@@ -3654,6 +3654,27 @@
\end{importgraphic}
\end{note}
+\pnum
+\indextext{base class!ambiguous}%
+\indextext{base class!unambiguous}%
+If an object of class \tcode{D} has a single base class subobject of type \tcode{B},
+\tcode{B} is an \defnadj{unambiguous}{base class} of \tcode{D}.
+If an object of class \tcode{D} has more than one base class subobject of type \tcode{B},
+\tcode{B} is an \defnadj{ambiguous}{base class} of \tcode{D}.
+\begin{example}
+\begin{codeblock}
+class B { @\commentellip@ };
+class MX : public B { @\commentellip@ };
+class MY : public B { @\commentellip@ };
+class D1 : public MX, public MY { @\commentellip@ }; // \tcode{B} is an ambiguous base class of \tcode{D1}
+class D2 : public MX, public B { @\commentellip@ }; // \tcode{B} is an ambiguous base class of \tcode{D2}
+
+class VMX : virtual public B { @\commentellip@ };
+class VMY : virtual public B { @\commentellip@ };
+class D3 : public VMX, public VMY { @\commentellip@ }; // \tcode{B} is an unambiguous base class of \tcode{D3}
+\end{codeblock}
+\end{example}
+
\rSec2[class.virtual]{Virtual functions}%
\indextext{function!virtual|(}%
\indextext{type!polymorphic}%
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