Index: trunk/doc/user/06_features/hierarchic/index.html
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--- trunk/doc/user/06_features/hierarchic/index.html	(revision 10188)
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@@ -15,9 +15,14 @@
 <a href="../../../design/06_hierarchy_imp.html"> implementation notes </a>.
 
 <p>
+After a brief intro, this document splits use cases in three categories. The
+<i>basic</i> category contains the most trivial use cases with an intro on
+how to set up a hierarchic design. The intermediate category contains more
+advanced approaches, still limiting addressing to two different types. Finally
+the expert category discusses usage that exploits the full potential of
+sch-rnd but requires deeper understanding.
 
 
-
 <h3 autotoc="yes"> Non-hierarchic cases </h3>
 <p>
 A non-hierarchic design has a single sheet or a set of sheets, with or