diff --git a/federatedscope/core/configs/cfg_data.py b/federatedscope/core/configs/cfg_data.py
index e9be227b2..2e7515bf2 100644
--- a/federatedscope/core/configs/cfg_data.py
+++ b/federatedscope/core/configs/cfg_data.py
@@ -100,7 +100,7 @@ def extend_data_cfg(cfg):
     cfg.feat_engr.secure.dp = CN()  # under dev
 
     # prompt tuning
-    cfg.data.dataset_name = '' #TODO
+    cfg.data.dataset_name = ''  # TODO
     cfg.data.train_frac = 0.9
     cfg.data.num_train_per_client = -1