diff --git a/docs/strategy-callbacks.md b/docs/strategy-callbacks.md
index 005f94155..563b5a2cb 100644
--- a/docs/strategy-callbacks.md
+++ b/docs/strategy-callbacks.md
@@ -376,7 +376,7 @@ class AwesomeStrategy(IStrategy):
 
     def custom_exit_price(self, pair: str, trade: Trade,
                           current_time: datetime, proposed_rate: float,
-                          current_profit: float, exit_tag: Optional[str, **kwargs) -> float:
+                          current_profit: float, exit_tag: Optional[str], **kwargs) -> float:
 
         dataframe, last_updated = self.dp.get_analyzed_dataframe(pair=pair,
                                                                 timeframe=self.timeframe)
diff --git a/freqtrade/templates/subtemplates/strategy_methods_advanced.j2 b/freqtrade/templates/subtemplates/strategy_methods_advanced.j2
index 3fa36d506..ed40ef509 100644
--- a/freqtrade/templates/subtemplates/strategy_methods_advanced.j2
+++ b/freqtrade/templates/subtemplates/strategy_methods_advanced.j2
@@ -32,7 +32,7 @@ def custom_entry_price(self, pair: str, current_time: 'datetime', proposed_rate:
 
 def custom_exit_price(self, pair: str, trade: 'Trade',
                       current_time: 'datetime', proposed_rate: float,
-                      current_profit: float, exit_tag: Optional[str, **kwargs) -> float:
+                      current_profit: float, exit_tag: Optional[str], **kwargs) -> float:
     """
     Custom exit price logic, returning the new exit price.