diff --git a/README.md b/README.md
index 76c7986545dff169ce2722f22273efd824445244..62b57d6cdf731deece5c24ba9b6de6d623f3192a 100644
--- a/README.md
+++ b/README.md
@@ -186,7 +186,7 @@ Participants can run the evaluation protocol for their model locally with or wit
 
 ## Note about Dummy test data
 
-The file `dummy_data_task1.json` is a dummy test dataset to test your code before submission. All dialogues in the dataset based on a same pair of persona A and persona B, but the actual test dataset for evaluation is not like this and was created based on different pairs of personas.
+The file `dummy_data_task1.json` is a dummy test dataset to test your code before submission. All dialogues in the dataset based on a same pair of persona A and persona B, but the actual test dataset for evaluation is not like this and was created based on different pairs of personas. Besides, the data field **persona A** and **gold_reference** will be **invisible** in the real evaluation data. To be more clear, we label the invisible fields as an illustration in `dummy_data_task1_with_notes.json`.
 
 ## Contributing