diff --git a/express/lib/random_number.js b/express/lib/random_number.js
index d8eaaba..51cc38b 100644
--- a/express/lib/random_number.js
+++ b/express/lib/random_number.js
@@ -1 +1,19 @@
 // Code goes here
+<!DOCTYPE html>
+<html>
+<body>
+
+<h2>JavaScript Math</h2>
+
+<p>Math.floor(Math.random() * 10) returns a random integer between 0 and 9 (both 
+included):</p>
+
+<p id="demo"></p>
+
+<script>
+document.getElementById("demo").innerHTML =
+Math.floor(Math.random() * 10);
+</script>
+
+</body>
+</html>
