diff --git a/abi.html b/abi.html
index 700d331..dc00dea 100644
--- a/abi.html
+++ b/abi.html
@@ -792,10 +792,10 @@ <h3><a href="#class-types"> 2.4 Non-POD Class Types </a></h3>
 <p>
 <li> <h5> Allocation of Members Other Than Virtual Bases </h5>
 <p>
-For each data component D (first the primary base of C, if any, then
+Each data component D (first the primary base of C, if any, then
 the non-primary, non-virtual direct base classes in declaration order,
 then the non-static data members and unnamed bit-fields in declaration
-order), allocate as follows:
+order) is laid out in order. If C is not a union, allocate as follows:
 
   <ol type=1>
 
@@ -913,6 +913,10 @@ <h3><a href="#class-types"> 2.4 Non-POD Class Types </a></h3>
 
   </ol>
 
+  <p>
+  If C is a union, D is placed at offset 0, but dsize(C) and sizeof(C)
+  are updated as for a non-union member, as described above.
+
   <p>
   After all such components have been allocated, set nvalign(C) =
   align(C) and nvsize(C) = sizeof(C).  The values of nvalign(C) and