X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/sod/blobdiff_plain/e97b16774761de536ae1d6b8e3f4a2108b69eb5c..f9bc613cce1e164f09addcb7013510d5fabc801b:/lib/sod-structs.3

diff --git a/lib/sod-structs.3 b/lib/sod-structs.3
index febcdf5..7ac5ccc 100644
--- a/lib/sod-structs.3
+++ b/lib/sod-structs.3
@@ -626,6 +626,9 @@ for each of
 superclasses
 .IR A
 in the same chain in some (unimportant) order.
+The (somewhat obtuse) purpose of this union is to
+engage the `common initial sequence' rule of
+C99 (clause 6.5.2.3).
 .PP
 The
 .B ichain