diff --git a/pywxdump/wx_info/merge_db.py b/pywxdump/wx_info/merge_db.py
index 6a6135a..a70a889 100644
--- a/pywxdump/wx_info/merge_db.py
+++ b/pywxdump/wx_info/merge_db.py
@@ -406,6 +406,10 @@ def merge_real_time_db(key, db_path: str, merge_path: str, CreateTime: int = 0,
 
 
 def all_merge_real_time_db(key, wx_path, merge_path):
+    """
+    合并所有实时数据库
+    注：这是全量合并，会有可能产生重复数据，需要自行去重
+    """
     if not merge_path or not key or not wx_path or not wx_path:
         return False, "msg_path or media_path or wx_path or key is required"
     try: