diff --git a/qlib/backtest/report.py b/qlib/backtest/report.py
index b4b9c5f2e..a364b10db 100644
--- a/qlib/backtest/report.py
+++ b/qlib/backtest/report.py
@@ -25,7 +25,15 @@ class Report:
 
     Implementation:
         daily report of the account
-        contain those followings: returns, costs turnovers, accounts, cash, bench, value
+        contain those followings: return, cost, turnover, account, cash, bench, value
+        For each step(bar/day/minute), each column represents
+        - return: the return of the portfolio generated by strategy **without transaction fee**.
+        - cost: the transaction fee and slippage.
+        - account: the total value of assets(cash and securities are both included) in user account based on the close price of each step.
+        - cash: the amount of cash in user's account.
+        - bench: the return of the benchmark
+        - value: the total value of securities/stocks/instruments (cash is excluded).
+        
         update report
     """