diff --git a/activities.json b/activities.json
index 6cf2a6c..b9a52dd 100644
--- a/activities.json
+++ b/activities.json
@@ -2154,5 +2154,17 @@
     "org": "WHATWG",
     "title": "timezonechange event",
     "url": "https://github.com/whatwg/html/pull/3047"
+  },
+  {
+    "ciuName": null,
+    "description": "IntersectionObserver extension for occlusion detection / clicjacking prevention.",
+    "id": "intersectionobserver-v2",
+    "mozBugUrl": "https://bugzilla.mozilla.org/show_bug.cgi?id=1896900",
+    "mozPosition": "positive",
+    "mozPositionDetail": "Security positive, interop concerns are being addressed.",
+    "mozPositionIssue": 109,
+    "org": "W3C",
+    "title": "IntersectionObserver V2",
+    "url": "https://github.com/w3c/IntersectionObserver/pull/523"
   }
 ]