diff --git a/pylib/embedding/pgvector.py b/pylib/embedding/pgvector.py
index b2edcd7..8dc5a63 100644
--- a/pylib/embedding/pgvector.py
+++ b/pylib/embedding/pgvector.py
@@ -433,6 +433,8 @@ async def insert(
 
             content (str): text content of the message
 
+            timestamp (datetime, optional): timestamp of the message, defaults to current time
+
             metadata (dict[str, str], optional): additional metadata of the message
         '''
         if not timestamp: