update

src/util.jl

@@ -17,6 +17,8 @@ using ..type
     Value 2.0 makes MCTS aggressively search the tree.
 # Return
   - `selectedNode::MCTSNode`
+    child node with highest UCT score. UCT score balances between exploitation (state value) 
+    and exploration (visit count) based on the exploration weight w.
 
 # Example
 ```jldoctest
@@ -133,7 +135,6 @@ end
 
 
 
-
 
 
 end # module util