diff --git a/docs_src/queries/docs009.py b/docs_src/queries/docs009.py
index 5e2bced..74ecc71 100644
--- a/docs_src/queries/docs009.py
+++ b/docs_src/queries/docs009.py
@@ -1,29 +1,33 @@
 # 1. like in example above
-await Car.objects.select_related("manufacturer").fields(
-    ["id", "name", "manufacturer__name"]
-).all()
+await Car.objects.select_related('manufacturer').fields(['id', 'name', 'manufacturer__name']).all()
 
 # 2. to mark a field as required use ellipsis
-await Car.objects.select_related("manufacturer").fields(
-    {"id": ..., "name": ..., "manufacturer": {"name": ...}}
-).all()
+await Car.objects.select_related('manufacturer').fields({'id': ...,
+                                                         'name': ...,
+                                                         'manufacturer': {
+                                                             'name': ...}
+                                                         }).all()
 
 # 3. to include whole nested model use ellipsis
-await Car.objects.select_related("manufacturer").fields(
-    {"id": ..., "name": ..., "manufacturer": ...}
-).all()
+await Car.objects.select_related('manufacturer').fields({'id': ...,
+                                                         'name': ...,
+                                                         'manufacturer': ...
+                                                         }).all()
 
 # 4. to specify fields at last nesting level you can also use set - equivalent to 2. above
-await Car.objects.select_related("manufacturer").fields(
-    {"id": ..., "name": ..., "manufacturer": {"name"}}
-).all()
+await Car.objects.select_related('manufacturer').fields({'id': ...,
+                                                         'name': ...,
+                                                         'manufacturer': {'name'}
+                                                         }).all()
 
 # 5. of course set can have multiple fields
-await Car.objects.select_related("manufacturer").fields(
-    {"id": ..., "name": ..., "manufacturer": {"name", "founded"}}
-).all()
+await Car.objects.select_related('manufacturer').fields({'id': ...,
+                                                         'name': ...,
+                                                         'manufacturer': {'name', 'founded'}
+                                                         }).all()
 
 # 6. you can include all nested fields but it will be equivalent of 3. above which is shorter
-await Car.objects.select_related("manufacturer").fields(
-    {"id": ..., "name": ..., "manufacturer": {"id", "name", "founded"}}
-).all()
+await Car.objects.select_related('manufacturer').fields({'id': ...,
+                                                         'name': ...,
+                                                         'manufacturer': {'id', 'name', 'founded'}
+                                                         }).all()