diff --git a/freqtrade/persistence.py b/freqtrade/persistence.py
index e0d433a24..56fe336d2 100644
--- a/freqtrade/persistence.py
+++ b/freqtrade/persistence.py
@@ -207,6 +207,7 @@ class Trade(_DECL_BASE):
         Calculates the profit in percentage (including fee).
         :param rate: rate to compare with (optional).
         If rate is not set self.close_rate will be used
+        :param fee: fee to use on the close rate (optional).
         :return: profit in percentage as float
         """
         getcontext().prec = 8