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diff --git a/assignment4.mdwn b/assignment4.mdwn
index 9f566758..54a3bf20 100644
--- a/assignment4.mdwn
+++ b/assignment4.mdwn
@@ -81,7 +81,7 @@ Suppose we had a pair of fixed point operators, `Y1` and `Y2`, that operated on
 If we gave you such a `Y1` and `Y2`, how would you implement the above definitions of `even` and `odd`?
 
 					
-<LI>(More challenging.) Using our derivation of Y from the [[Week2]] notes as a model, construct a pair `Y1` and `Y2` that behave in the way described.
+<LI>(More challenging.) Using our derivation of Y from the [Week3 notes](/week3/#index4h2) as a model, construct a pair `Y1` and `Y2` that behave in the way described.
 
 (See [[hints/Assignment 4 hint 4]] if you need some hints.)