diff --git a/download_model.py b/download_model.py
index 54e4bb60c..0bd4f26ab 100644
--- a/download_model.py
+++ b/download_model.py
@@ -1,28 +1,42 @@
+"""Downloads GPT-2 Model.
+
+Options:
+ python download_model.py 117M|124M|345M|774M|1558M
+"""
 import os
 import sys
 import requests
 from tqdm import tqdm
 
 if len(sys.argv) != 2:
-    print('You must enter the model name as a parameter, e.g.: download_model.py 124M')
-    sys.exit(1)
+  print('You must enter the model name as a parameter, e.g.: download_model.py '
+        '124M')
+  sys.exit(1)
 
 model = sys.argv[1]
 
 subdir = os.path.join('models', model)
 if not os.path.exists(subdir):
-    os.makedirs(subdir)
-subdir = subdir.replace('\\','/') # needed for Windows
-
-for filename in ['checkpoint','encoder.json','hparams.json','model.ckpt.data-00000-of-00001', 'model.ckpt.index', 'model.ckpt.meta', 'vocab.bpe']:
-
-    r = requests.get("https://openaipublic.blob.core.windows.net/gpt-2/" + subdir + "/" + filename, stream=True)
+  os.makedirs(subdir)
+subdir = subdir.replace('\\', '/')  # needed for Windows
 
-    with open(os.path.join(subdir, filename), 'wb') as f:
-        file_size = int(r.headers["content-length"])
-        chunk_size = 1000
-        with tqdm(ncols=100, desc="Fetching " + filename, total=file_size, unit_scale=True) as pbar:
-            # 1k for chunk_size, since Ethernet packet size is around 1500 bytes
-            for chunk in r.iter_content(chunk_size=chunk_size):
-                f.write(chunk)
-                pbar.update(chunk_size)
+for filename in [
+    'checkpoint', 'encoder.json', 'hparams.json',
+    'model.ckpt.data-00000-of-00001', 'model.ckpt.index', 'model.ckpt.meta',
+    'vocab.bpe'
+]:
+  url = 'https://openaipublic.blob.core.windows.net/gpt-2/{}/{}'.format(
+      subdir, filename)
+  r = requests.get(url, stream=True)
+  with open(os.path.join(subdir, filename), 'wb') as f:
+    file_size = int(r.headers['content-length'])
+    chunk_size = 1000
+    with tqdm(
+        ncols=100,
+        desc='Fetching ' + filename,
+        total=file_size,
+        unit_scale=True) as pbar:
+      # 1k for chunk_size, since Ethernet packet size is around 1500 bytes.
+      for chunk in r.iter_content(chunk_size=chunk_size):
+        f.write(chunk)
+        pbar.update(chunk_size)