diff --git a/pytorch_lightning/models/trainer.py b/pytorch_lightning/models/trainer.py
index 597aa540..1d966188 100644
--- a/pytorch_lightning/models/trainer.py
+++ b/pytorch_lightning/models/trainer.py
@@ -1,3 +1,6 @@
+"""
+The trainer handles all the logic for running a val loop, training loop, distributing, etc...
+"""
 from time import sleep
 import subprocess
 import traceback
@@ -23,6 +26,7 @@ try:
 except ModuleNotFoundError:
     APEX_AVAILABLE = False
 
+
 class Trainer(TrainerIO):
 
     def __init__(self,