diff --git a/experiments/outline-editor/index.html b/experiments/outline-editor/index.html
index fdecc3f..9c71956 100755
--- a/experiments/outline-editor/index.html
+++ b/experiments/outline-editor/index.html
@@ -54,6 +54,7 @@ var setup = function(){
       - need to: 
         - add undo to `.Block(..)`
         - group `new` and `cange` into one undo action...
+          - _undo chaining? ...i.e. support nested arrays?_
   - BUG: mobile browsers behave quite chaotically ignoring parts of the styling...
     - FF:
       - zooming on edited field