diff --git a/README.md b/README.md
index 061998d..11fe338 100644
--- a/README.md
+++ b/README.md
@@ -20,14 +20,14 @@ import 'package:dart_mercure/dart_mercure.dart';
 main() {
 
   // Token generate with "mercure" JWT_KEY
-  String token = "YOUR_JWT_TOKEN";
-  String hub_url = "http://MERCURE_HUB_URL/hub";
-  String topic = "http://YOUR_TOPIC/FOO";
+  var token = 'YOUR_JWT_TOKEN';
+  var hub_url = 'http://MERCURE_HUB_URL/hub';
+  var topic = 'http://YOUR_TOPIC/FOO';
 
-  Mercure mercure = Mercure(token: token, hub_url: hub_url);
+  var mercure = Mercure(token: token, hub_url: hub_url);
 
   // Subscribes to topics
-  mercure.subscribeTopics(topics: <String> [topic, "ANOTHER_TOPIC"], onData: (Event event) {
+  mercure.subscribeTopics(topics: <String> [topic, 'ANOTHER_TOPIC'], onData: (Event event) {
     print(event.data);
   });
 
@@ -37,9 +37,9 @@ main() {
   });
 
   // Publish on topic
-  mercure.publish(topic: topic, data: "DATA").then((status) {
+  mercure.publish(topic: topic, data: 'DATA').then((status) {
     if(status == 200) {
-      print("Message Sent");
+      print('Message Sent');
     }
     else {
       print('Message Failed with code : $status');