Index: kernel/include/IMP/internal/AttributeTable.h
===================================================================
--- kernel/include/IMP/internal/AttributeTable.h	(revision 481)
+++ kernel/include/IMP/internal/AttributeTable.h	(working copy)
@@ -24,7 +24,11 @@
 namespace internal
 {
 
-/** \internal */
+/** \internal 
+    If memory becomes a problem then either use a char table to look up
+    actual entries or use perfect hashing. 
+    http://burtleburtle.net/bob/hash/perfect.html
+*/
 template <class T, class VT>
 class AttributeTable
 {