diff --git a/solution/2600-2699/2621.Sleep/README_EN.md b/solution/2600-2699/2621.Sleep/README_EN.md
index 4d33630e3513d..5a728253ff546 100644
--- a/solution/2600-2699/2621.Sleep/README_EN.md
+++ b/solution/2600-2699/2621.Sleep/README_EN.md
@@ -69,6 +69,27 @@ async function sleep(millis: number): Promise<void> {
 
 <!-- tabs:end -->
 
+<!-- tabs:start -->
+
+#### JavaScript
+
+```js
+/**
+ * @param {number} millis
+ * @return {Promise}
+ */
+async function sleep(millis) {
+    return new Promise ( r => setTimeout(r,millis))
+}
+
+/**
+ * let t = Date.now()
+ * sleep(100).then(() => console.log(Date.now() - t)) // 100
+ */
+
+<!-- tabs:end -->
+
 <!-- solution:end -->
 
 <!-- problem:end -->
+```