diff --git a/graph.rkt b/graph.rkt
index f4603a7..a7d6613 100644
--- a/graph.rkt
+++ b/graph.rkt
@@ -14,7 +14,9 @@
 
 #lang typed/racket
 
-;https://stackoverflow.com/questions/65386334/racket-generic-graph-library-in-typed-racket
+;;; This file implements Alex Knauth's solution presented here:
+;;;
+;;; https://stackoverflow.com/questions/65386334/racket-generic-graph-library-in-typed-racket
 
 (module graph-wrapper racket
   (require (prefix-in g: graph))