diff --git a/diff2.js b/diff2.js
index 1d7e255..6f880aa 100644
--- a/diff2.js
+++ b/diff2.js
@@ -696,6 +696,8 @@ function(A, B, cmp){
 //
 // NOTE: this is generic -- does not care what it compares...
 //
+// XXX try as an alternative approach to implement the tree cmp approach 
+// 		from diff.js...
 // XXX would be nice to be able to mixin stuff cmp -- to wrap container 
 // 		type and the like...
 var diffSections =