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diff --git a/demo/counter.ur b/demo/counter.ur
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--- a/demo/counter.ur
+++ b/demo/counter.ur
@@ -1,3 +1,4 @@
+(* Workhorse function, which [main] will call *)
fun counter n = return <xml><body>
Current counter: {[n]}<br/>
<a link={counter (n + 1)}>Increment</a><br/>