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diff --git a/topics/week1_kapulet_advanced.mdwn b/topics/week1_kapulet_advanced.mdwn
index 2137d114..06a20438 100644
--- a/topics/week1_kapulet_advanced.mdwn
+++ b/topics/week1_kapulet_advanced.mdwn
@@ -173,6 +173,8 @@ We've already come across the `id` function, namely λ `x. x`.
 Other common functions are `fst`, which takes two arguments and returns the first of them; `snd`, which takes two arguments and returns the second of them; and `swap`, which takes two arguments and returns them both but with their positions swapped. A fourth function is `dup`, which takes one argument and returns it twice.
 These functions can be defined like this:
 
+<a id=functions></a>
+
     let
       fst (x, y) = x;
       snd (x, y) = y;