diff --git a/src/mcts.jl b/src/mcts.jl
index c4d8d47..3648ce9 100644
--- a/src/mcts.jl
+++ b/src/mcts.jl
@@ -126,7 +126,7 @@ julia>
 # TODO
   [] update docstring
   [] try loop should limit to 3 times. if not succeed, skip
-
+  [] newNodeKey ∉ keys(node.children). New state may have semantic vector close enought to one of existing child state. Which can be assume that they are the same state semantically-wise. 
 # Signature
 """
 function expand(a::T1, node::MCTSNode, decisionMaker::Function, 
@@ -190,7 +190,7 @@ function simulate(a, node::MCTSNode, decisionMaker::Function, progressValueEstim
       node = selectChildNode(node)
     end
   end
-
+  #BUG new expanded state has reward but it is not included because it is over maxdept by 1 state
   return simTrajectoryReward
 end