diff --git a/diff2.js b/diff2.js
index 4865d7a..59c17df 100644
--- a/diff2.js
+++ b/diff2.js
@@ -703,6 +703,9 @@ function(A, B, cmp){
 // 	]
 //
 // NOTE: this is generic -- does not care what it compares...
+//
+// XXX would be nice to be able to mixin stuff cmp -- to wrap container 
+// 		type and the like...
 var diffSections =
 module.diffSections =
 function(A, B, cmp){
@@ -731,8 +734,12 @@ function(A, B, cmp){
 // 		insert an item into an array, this effectively changes all other 
 // 		items (shifting their indexes by the number of items inserted)... 
 // 		...need to treat this gracefully...
-// 		......ignore array index???
-// 			...to do this we need to know object type per element compared...
+// 		we can:
+// 			- ignore array index???
+// 				...to do this we need to know object type per element 
+// 				compared...
+// 			- handle item shifts gracefully...
+// 			- diff recursively instead of flat...
 var diff =
 function(A, B){
 	return diffSections(