diff --git a/torchy_baselines/ppo/ppo.py b/torchy_baselines/ppo/ppo.py
index bc66171..b0e9de2 100644
--- a/torchy_baselines/ppo/ppo.py
+++ b/torchy_baselines/ppo/ppo.py
@@ -317,7 +317,7 @@ class PPO(BaseRLModel):
         """
         Returns a dict of all the optimizers and their parameters
         
-        :return: (Dict) of optimizer names and their state_dict 
+        :return: (dict) of optimizer names and their state_dict 
         """
         return {"opt": self.policy.optimizer.state_dict()}