diff --git a/index.js b/index.js
index 4f1f5e4..e53db61 100644
--- a/index.js
+++ b/index.js
@@ -460,6 +460,11 @@ export class MyDurableObject {
 
   async Heart() {
     if (this.phase !== 'running' || !this.hbActive) return this.stopHeartbeat();
+    
+    ///////////// Debug: To be removed
+    this.notify(`Heartbeat for ${this.rid}: age ${this.age}`, 3, ['heartbeat']);
+    ///////////// Debug: To be removed
+
     if (++this.age * HB_INTERVAL_MS >= MAX_RUN_MS) return this.fail(`Run timed out after ${MAX_RUN_MS / 60000} minutes.`);
     await this.state.storage.setAlarm(Date.now() + HB_INTERVAL_MS).catch(() => {});
   }