diff --git a/rdagent/scenarios/data_science/dev/runner/eval.py b/rdagent/scenarios/data_science/dev/runner/eval.py
index ca5be0d3..b355b91a 100644
--- a/rdagent/scenarios/data_science/dev/runner/eval.py
+++ b/rdagent/scenarios/data_science/dev/runner/eval.py
@@ -37,6 +37,7 @@ class DSRunnerFeedback(CoSTEERSingleFeedback):
     """
 
     acceptable: bool | None = None
+    reasoning: str | None = None
     hyperparameter_tuning_decision: bool | None = None
     hyperparameter_tuning_suggestion: str | None = None
     score: str | None = None