diff --git a/1-js/05-data-types/08-weakmap-weakset/01-recipients-read/solution.md b/1-js/05-data-types/08-weakmap-weakset/01-recipients-read/solution.md
index f0c6ed45..6a4c20ba 100644
--- a/1-js/05-data-types/08-weakmap-weakset/01-recipients-read/solution.md
+++ b/1-js/05-data-types/08-weakmap-weakset/01-recipients-read/solution.md
@@ -1,6 +1,6 @@
 Let's store read messages in `WeakSet`:
 
-```js
+```js run
 let messages = [
   {text: "Hello", from: "John"},
   {text: "How goes?", from: "John"},