Index: 06_hierarchy_imp.html
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--- 06_hierarchy_imp.html	(revision 4731)
+++ 06_hierarchy_imp.html	(revision 4732)
@@ -37,7 +37,7 @@
 and it's then a single-tree setup. So how does the multi-tree setup differs from
 the single-tree setup? Only that it does not have such a single top-level sheet
 that references all other. The reason to keep this possibility open is the
-project file. A project file can list all the top level sheets, having to have
+project file. A project file can list all the top level sheets (roots), having to have
 a redundant or extra top level file just for this list would be annoying. On
 the other hand, the project file can describe non-cschem-aspects of the project,
 which a schematics sheet can't, so it's not possible to omit the project file