X-Git-Url: https://git.distorted.org.uk/~mdw/sod/blobdiff_plain/e97b16774761de536ae1d6b8e3f4a2108b69eb5c..dc162ca6f0f2bbcb045a03df61c76e37c48d85a7:/doc/structures.tex

diff --git a/doc/structures.tex b/doc/structures.tex
index 1c9646f..7cc825a 100644
--- a/doc/structures.tex
+++ b/doc/structures.tex
@@ -409,7 +409,8 @@ and this is followed by corresponding members
   struct $A$__ichain_$h$ $a$;
 \end{prog}
 for each of $C$'s superclasses $A$ in the same chain in some (unimportant)
-order.
+order.  The (somewhat obtuse) purpose of this union is to engage the `common
+initial sequence' rule of \cite[6.5.2.3]{FIXME:C99}.
 
 \subsubsection{The ichain structure}
 The @|ichain| structure contains (in order), a pointer
