diff --git a/docs/website/docs/examples/nested_data/code/nested_data-snippets.py b/docs/website/docs/examples/nested_data/code/nested_data-snippets.py
index cda248a4fc..d6328fc2c5 100644
--- a/docs/website/docs/examples/nested_data/code/nested_data-snippets.py
+++ b/docs/website/docs/examples/nested_data/code/nested_data-snippets.py
@@ -30,13 +30,13 @@ def mongodb_collection(
         write_disposition: Optional[str] = dlt.config.value,
     ) -> Any:
         # set up mongo client
-        client = MongoClient(connection_url, uuidRepresentation="standard", tz_aware=True)
+        client: Any = MongoClient(connection_url, uuidRepresentation="standard", tz_aware=True)
         mongo_database = client.get_default_database() if not database else client[database]
         collection_obj = mongo_database[collection]
 
         def collection_documents(
-            client,
-            collection,
+            client: Any,
+            collection: Any,
             incremental: Optional[dlt.sources.incremental[Any]] = None,
         ) -> Iterator[TDataItem]:
             LoaderClass = CollectionLoader
@@ -56,8 +56,8 @@ def collection_documents(
     class CollectionLoader:
         def __init__(
             self,
-            client,
-            collection,
+            client: Any,
+            collection: Any,
             incremental: Optional[dlt.sources.incremental[Any]] = None,
         ) -> None:
             self.client = client