diff --git a/src/index.ts b/src/index.ts
index 5393d33..9a76cba 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -21,8 +21,21 @@ const HelloWorldIntentHandler = {
         return Alexa.getRequestType(handlerInput.requestEnvelope) === 'IntentRequest'
             && Alexa.getIntentName(handlerInput.requestEnvelope) === 'HelloWorldIntent';
     },
-    handle(handlerInput: Alexa.HandlerInput) {
-        const speakOutput = 'Hello World!';
+    async handle(handlerInput: Alexa.HandlerInput) {
+
+        const attributesManager = handlerInput.attributesManager;
+
+        const attributes = await attributesManager.getPersistentAttributes();
+
+        if (attributes.counter === undefined) {
+            attributes.counter = 0;
+        } else {
+            attributes.counter += 1;
+        }
+
+        attributesManager.setPersistentAttributes(attributes);
+
+        const speakOutput = 'Hello World! You have invoked this skill ' + attributes.counter + ' times.';
 
         return handlerInput.responseBuilder
             .speak(speakOutput)