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diff --git a/doc/orb/marshalling b/doc/orb/marshalling
index 286eff4..e62ae48 100644
--- a/doc/orb/marshalling
+++ b/doc/orb/marshalling
@@ -39,12 +39,16 @@ objlist array.
 
 Virtual structs are prefaced with a header, which consists of
 the following, in order:
-1. 128-bit GUID of the most derived vstruct type
-2. 160-bit SHA-1 of the vstruct type info
-3. 32-bit objlist-offset of an introspection object
-4. 32-bit length of vstruct, including header, and all referenced
+1. 32-bit length of vstruct, including header, and all referenced
 data chunks, which must be contiguously appended to the vstruct body
-5. 32-bit reserved field
+2. 32-bit offset of start of actual struct
+3. 128-bit GUID of the most derived vstruct type
+5. 32-bit objlist-offset of the vstruct's object handles, the first
+of which is introspection object
+6. 32-bit length of vstruct objlist in handles
+7. 32-bit offset of an area within the vstruct where the objlist can
+be copied.
+8. 32-bit reserved field
 
 The requirement for all referenced data chunks to be contiguous with
 the vstruct means that scatter-gather and zero-copy cannot be done;
@@ -54,8 +58,15 @@ later be accessed through introspection, or be passed to another
 process that does know the derived type).  For this reason, vstructs
 should generally not be used to pass large chunks of data.
 
-The introspection object reference may be NULL; in this case, the
-SHA-1 field is ignored.
+Likewise, object handles must be preserved even if they are only
+referenced in an unknown-type portion of the vstruct.  To facilitate
+this, all handles referenced from the vstruct must be contiguous in
+the objlist (even if this means duplications), and there must be an
+area in the vstruct blob where unmarshalling code can copy the
+translated objlist.
+
+The introspection object reference at the beginning of the vstruct
+objlist may be NULL.
 
 Op1: Get Interface List
 -----------------------