diff --git a/src/memos/mem_user/redis_persistent_user_manager.py b/src/memos/mem_user/redis_persistent_user_manager.py
index 48c89c663..ef6502ced 100644
--- a/src/memos/mem_user/redis_persistent_user_manager.py
+++ b/src/memos/mem_user/redis_persistent_user_manager.py
@@ -32,7 +32,6 @@ def __init__(
         """Initialize the Redis persistent user manager.
 
         Args:
-            user_id (str, optional): User ID. Defaults to "root".
             host (str): Redis server host. Defaults to "localhost".
             port (int): Redis server port. Defaults to 6379.
             password (str): Redis password. Defaults to "".
diff --git a/src/memos/reranker/concat.py b/src/memos/reranker/concat.py
index b39496a1c..7efa1521e 100644
--- a/src/memos/reranker/concat.py
+++ b/src/memos/reranker/concat.py
@@ -75,7 +75,8 @@ def concat_original_source(
     Merge memory items with original dialogue.
     Args:
         graph_results (list[TextualMemoryItem]): List of memory items with embeddings.
-        merge_field (List[str]): List of fields to merge.
+        rerank_source (str, optional): Comma-separated metadata field names to read
+            the source text from. Defaults to the 'sources' field when None.
     Returns:
         list[str]: List of memory and concat orginal memory.
     """