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diff --git a/implementing_trees.mdwn b/implementing_trees.mdwn
index 31dc3fd0..f83823a9 100644
--- a/implementing_trees.mdwn
+++ b/implementing_trees.mdwn
@@ -128,9 +128,9 @@ where the previous tree should be placed.
 
 However, when using trees as a computational tool, one usually does have
 latitude about how to structure a larger tree---in the same way that we had the
-freedom to implement our sets with lists whose members were just appended in
-the order we built the set up, or instead with lists whose members were ordered
-numerically.
+freedom to implement our [sets](/week4/#index9h1) with lists whose members were
+just appended in the order we built the set up, or instead with lists whose
+members were ordered numerically.
 
 When building a new tree, one strategy for where to put the new element and
 where to put the existing tree would be to always lean towards a certain side.