tuned

--- a/src/HOL/Library/Tree.thy	Wed Dec 07 08:14:40 2016 +0100
+++ b/src/HOL/Library/Tree.thy	Wed Jan 04 14:26:08 2017 +0100
@@ -356,8 +356,6 @@
 lemma wbalanced_subtrees: "\<lbrakk> wbalanced t; s \<in> subtrees t \<rbrakk> \<Longrightarrow> wbalanced s"
 using [[simp_depth_limit=1]] by(induction t arbitrary: s) auto
 
-(* show wbalanced \<Longrightarrow> balanced and use that in Balanced.thy *)
-
 
 subsection \<open>@{const path_len}\<close>