diff --git a/pylib/embedding/pgvector.py b/pylib/embedding/pgvector.py
index c0b7242..783306f 100644
--- a/pylib/embedding/pgvector.py
+++ b/pylib/embedding/pgvector.py
@@ -328,7 +328,7 @@ async def insert(
 
     async def insert_many(
             self,
-            content_list: Iterable[tuple[str, str | None,  str | None, list[int], list[str]]]
+            content_list: Iterable[tuple[str, str | None, list[int], list[str]]]
     ) -> None:
         '''
         Update a table with one or more embedded documents