diff --git a/ppcls/utils/save_load.py b/ppcls/utils/save_load.py
index 047c934b4b9d50bf4f27e652f65c424bd28ac964..e68a7af416a9f45061dc53640aea9b1ee5b09089 100644
--- a/ppcls/utils/save_load.py
+++ b/ppcls/utils/save_load.py
@@ -31,7 +31,7 @@ __all__ = ['init_model', 'save_model']
 
 def _mkdir_if_not_exist(path):
     """
-    mkdir if not exists
+    mkdir if not exists, ignore the exception when multiprocess mkdir together
     """
     if not os.path.exists(path):
         try: