diff --git a/web/bookmarklet-iframe.html b/web/bookmarklet-iframe.html
index e49f2d12..86badb8e 100644
--- a/web/bookmarklet-iframe.html
+++ b/web/bookmarklet-iframe.html
@@ -24,6 +24,7 @@
       function processDataFromWiki(data) {
          if (!isActive) return;
 
+         console.log("Heartbeat received")
          if (data.type == 'heartbeat') {
             sendDataToWiki('heartbeatAck')
             lastHeartbeat = Date.now();