diff --git a/rs.rkt b/rs.rkt
index 23a78d7..b01d86c 100644
--- a/rs.rkt
+++ b/rs.rkt
@@ -23,7 +23,8 @@
 ;;; inhibitors, and the products, respectively.
 (struct reaction ([reactants : (Setof Symbol)]
                   [inhibitors : (Setof Symbol)]
-                  [products : (Setof Symbol)]))
+                  [products : (Setof Symbol)])
+  #:transparent)
 
 ;;; A reaction is enabled on a set if all of its reactants are in the
 ;;; set and none of its inhibitors are.