diff --git a/wikidata/query-wikidata.ipynb b/wikidata/query-wikidata.ipynb
index 56e087a75f29f3f744be80318d0d64b10cac3542..607b0a29c23484185475e89acd7f179cf8436873 100644
--- a/wikidata/query-wikidata.ipynb
+++ b/wikidata/query-wikidata.ipynb
@@ -30,6 +30,7 @@
     "    propSelection = \"\"\n",
     "    for label, pid in property_labels_to_ids.items():\n",
     "        if label.endswith(\"_id\") or label.startswith(\"image\"):\n",
+    "            # literal values, including URIs - this needs to be solved in a more generic way\n",
     "            propSelection += f\"\"\"\n",
     "                OPTIONAL {{ ?item wdt:{pid} ?{label}. }}\"\"\"\n",
     "        elif label.startswith(\"date\"):  \n",