diff --git a/docs/tutorial/PyMISP_tutorial.ipynb b/docs/tutorial/PyMISP_tutorial.ipynb
index c12a217..41282e1 100644
--- a/docs/tutorial/PyMISP_tutorial.ipynb
+++ b/docs/tutorial/PyMISP_tutorial.ipynb
@@ -358,9 +358,10 @@
     "# And the to_ids flag is set\n",
     "attributes = misp.search(controller='attributes', type_attribute='ip-src', to_ids=0, pythonify=True)\n",
     "\n",
+    "# Collect all event_id matching the searched attribute\n",
     "event_ids = set()\n",
     "for attr in attributes:\n",
-    "    event_ids.add(event_id)\n",
+    "    event_ids.add(attr.event_id)\n",
     "\n",
     "# Fetch all related events\n",
     "for event_id in event_ids:\n",