Index: trunk/doc/design/03_drawing.html
===================================================================
--- trunk/doc/design/03_drawing.html	(revision 3640)
+++ trunk/doc/design/03_drawing.html	(revision 3641)
@@ -527,7 +527,8 @@
 groups. The <i>direct</i> group lists
 all objects directly visible on the sheet, while the <i>indirect</i> group
 serves as a "local library", hosting invisible group objects that
-can be referenced from group_ref's from <i>direct</i>.
+can be referenced from group_ref's from <i>direct</i> or used by plugins (e.g.
+devmap).
 Furthermore a sheet has properties and attributes. The oid of the direct group
 is 2 and the oid of the indirect group is 1.