diff --git a/malen.js b/malen.js
index 8bd87b3..0f6e851 100644
--- a/malen.js
+++ b/malen.js
@@ -1,4 +1,18 @@
-WA.onEnterZone('malen-1', () => {
-    WA.sendChatMessage("Hello!", 'Mr Robot');
-})
+let helloWorldPopup;
 
+// Open the popup when we enter a given zone
+helloWorldPopup = WA.onEnterZone('malen-1', () => {
+    WA.openPopup("popupRectangle", 'Hello world!', [{
+        label: "Close",
+        className: "primary",
+        callback: (popup) => {
+            // Close the popup when the "Close" button is pressed.
+            popup.close();
+        }
+    });
+}]);
+
+// Close the popup when we leave the zone.
+WA.onLeaveZone('malen-1', () => {
+    helloWorldPopup.close();
+});