diff --git a/trees_and_graphs/README.md b/trees_and_graphs/README.md
index a8a5426..812f98e 100644
--- a/trees_and_graphs/README.md
+++ b/trees_and_graphs/README.md
@@ -45,7 +45,7 @@ def preorder(self, root):
 	return [root.val] + preorder(root.left) + preorder(root.right)
 ````
 
-- top-down (parameters are passed down to children).
+- top-down (parameters are passed down to children), so deserialize with a queue.
 
 
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