[hd] Improve write-up.

(Internal change: 2313776)

diff --git a/pxr/imaging/hd/flatteningSceneIndex.h b/pxr/imaging/hd/flatteningSceneIndex.h
index d90c0444f21570d53efd20648c9e9e89e3117b2c..fb04f6e2f99bef6b008ce6225d83fa4c64921b18 100644 (file)
--- a/pxr/imaging/hd/flatteningSceneIndex.h
+++ b/pxr/imaging/hd/flatteningSceneIndex.h
@@ -53,9 +53,11 @@ TF_DECLARE_REF_PTRS(HdFlatteningSceneIndex);
 /// A scene index that observes an input scene index and produces a comparable
 /// scene in which inherited state is represented at leaf prims.
 ///
-/// This kind of representation is typically required for legacy-style 
-/// render delegates that require all the information to be available at the
-/// leaf prims.
+/// This kind of representation is useful for render delegates that
+/// require some/all the information to be available at the leaf prims.
+/// It is also useful to express scene description composition functionality
+/// (e.g., material binding resolution that factors inherited opinions) via
+/// flattened data source provider(s).
 ///
 class HdFlatteningSceneIndex : public HdSingleInputFilteringSceneIndexBase
 {