diff --git a/examples/meta/continuations.pl b/examples/meta/continuations.pl
index cb31677..8661361 100644
--- a/examples/meta/continuations.pl
+++ b/examples/meta/continuations.pl
@@ -1,3 +1,6 @@
+% Based on
+% https://occasionallycogent.com/continuations_in_prolog/
+
 test(Cont, Term) :-
     writeln("Inside test"),
     reset(test_, Term, Cont),