From 3ba9dd15b494b2c9165eec2fe3dab5fbff12c9d1 Mon Sep 17 00:00:00 2001
From: Naoyuki Kanezawa <naoyuki.kanezawa@gmail.com>
Date: Sat, 7 Mar 2015 23:01:33 +0900
Subject: [PATCH] update README

---
 README.md | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/README.md b/README.md
index 085640a..ea4decb 100644
--- a/README.md
+++ b/README.md
@@ -95,6 +95,19 @@ socket.emit("foo", "woot", new Ack() {
 });
 ```
 
+And vice versa:
+
+```java
+// ack from client to server
+socket.on("foo", new Emitter.Listener() {
+  @Override
+  public void call(Object... args) {
+    Ack ack = (Ack) args[args.length - 1];
+    ack.call();
+  }
+});
+```
+
 Use custom SSL settings:
 
 ```java