diff --git a/manifest.json b/manifest.json
index 1c66dce..2500de2 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,5 +6,10 @@
   "categories": ["Advertising"],
   "provides": ["events"],
   "allowCustomFields": true,
-  "permissions": {}
+  "permissions": {
+    "access_client_kv": {
+      "description": "Stores UUIDs as cookies.",
+      "required": true
+    }
+  }
 }