diff --git a/utils.rkt b/utils.rkt
index bd117e3..10e1164 100644
--- a/utils.rkt
+++ b/utils.rkt
@@ -285,6 +285,11 @@
     (check-equal? (list-sets->list-strings (list (set 'x 'y) (set 'z) (set) (set 't)))
                   '("y x" "z" "" "t"))))
 
+
+;;; ===============
+;;; Pretty printing
+;;; ===============
+
 (: pretty-print-set (-> (Setof Any) String))
 (define (pretty-print-set s)
   (string-join (sort (set-map s any->string) string<?)))