diff --git a/freqtrade/freqai/RL/Base4ActionRLEnv.py b/freqtrade/freqai/RL/Base4ActionRLEnv.py
index 0c719ea92..1a235801c 100644
--- a/freqtrade/freqai/RL/Base4ActionRLEnv.py
+++ b/freqtrade/freqai/RL/Base4ActionRLEnv.py
@@ -103,7 +103,7 @@ class Base4ActionRLEnv(BaseEnvironment):
 
         return observation, step_reward, self._done, info
 
-    def is_tradesignal(self, action: int):
+    def is_tradesignal(self, action: int) -> bool:
         """
         Determine if the signal is a trade signal
         e.g.: agent wants a Actions.Long_exit while it is in a Positions.short
@@ -117,7 +117,7 @@ class Base4ActionRLEnv(BaseEnvironment):
                     (action == Actions.Long_enter.value and self._position == Positions.Long) or
                     (action == Actions.Long_enter.value and self._position == Positions.Short))
 
-    def _is_valid(self, action: int):
+    def _is_valid(self, action: int) -> bool:
         """
         Determine if the signal is valid.
         e.g.: agent wants a Actions.Long_exit while it is in a Positions.short
diff --git a/freqtrade/freqai/RL/Base5ActionRLEnv.py b/freqtrade/freqai/RL/Base5ActionRLEnv.py
index 8012ff1af..61abb8031 100644
--- a/freqtrade/freqai/RL/Base5ActionRLEnv.py
+++ b/freqtrade/freqai/RL/Base5ActionRLEnv.py
@@ -141,7 +141,7 @@ class Base5ActionRLEnv(BaseEnvironment):
         else:
             return self._current_tick - self._last_trade_tick
 
-    def is_tradesignal(self, action: int):
+    def is_tradesignal(self, action: int) -> bool:
         """
         Determine if the signal is a trade signal
         e.g.: agent wants a Actions.Long_exit while it is in a Positions.short
diff --git a/freqtrade/freqai/RL/BaseEnvironment.py b/freqtrade/freqai/RL/BaseEnvironment.py
index 7aa571697..3332e5a18 100644
--- a/freqtrade/freqai/RL/BaseEnvironment.py
+++ b/freqtrade/freqai/RL/BaseEnvironment.py
@@ -200,13 +200,13 @@ class BaseEnvironment(gym.Env):
             return 0.
 
     @abstractmethod
-    def is_tradesignal(self, action: int):
+    def is_tradesignal(self, action: int) -> bool:
         """
         Determine if the signal is a trade signal. This is
         unique to the actions in the environment, and therefore must be
         inherited.
         """
-        return
+        return True
 
     def _is_valid(self, action: int) -> bool:
         """
diff --git a/freqtrade/freqai/RL/BaseReinforcementLearningModel.py b/freqtrade/freqai/RL/BaseReinforcementLearningModel.py
index bddac23b3..af9874d90 100644
--- a/freqtrade/freqai/RL/BaseReinforcementLearningModel.py
+++ b/freqtrade/freqai/RL/BaseReinforcementLearningModel.py
@@ -38,7 +38,7 @@ class BaseReinforcementLearningModel(IFreqaiModel):
     User created Reinforcement Learning Model prediction class
     """
 
-    def __init__(self, **kwargs):
+    def __init__(self, **kwargs) -> None:
         super().__init__(config=kwargs['config'])
         self.max_threads = min(self.freqai_info['rl_config'].get(
             'cpu_count', 1), max(int(self.max_system_threads / 2), 1))