diff --git a/blog/blog.py b/blog/blog.py
index 190446c..c1f60c2 100644
--- a/blog/blog.py
+++ b/blog/blog.py
@@ -1,12 +1,13 @@
 import glob
 import shutil
-import datetime 
+import datetime
 import textwrap
 from pathlib import Path
 from blog.page import Page
 from blog.config import Config
 from jinja2 import Environment, FileSystemLoader, Template
 
+
 class Blog:
 
     def __init__(self, conf: Config):
@@ -69,7 +70,8 @@ class Blog:
             if updated < date:
                 updated = date
             articles += textwrap.indent(
-                textwrap.dedent(f"""\
+                textwrap.dedent(
+                    f"""\
                 <entry>
                     <title>{self.pages[filename].title}</title>
                     <link href="{self.conf.url}/pages/{filename}.html"/>
@@ -81,10 +83,13 @@ class Blog:
                         </div>
                     </content>
                 </entry>
-                """), 
-                "    ")
+                """
+                ),
+                "    ",
+            )
 
-        header = textwrap.dedent(f"""        <?xml version="1.0" encoding="utf-8"?>
+        header = textwrap.dedent(
+            f"""        <?xml version="1.0" encoding="utf-8"?>
         <feed xmlns="http://www.w3.org/2005/Atom">
             <title>{self.conf.title}</title>
             <subtitle>{self.conf.presentation}</subtitle>
@@ -96,11 +101,12 @@ class Blog:
             <email>{self.conf.author_mail}</email>
             </author>
             <id>urn:uuid:{self.conf.id}</id>
-        """)
+        """
+        )
 
         footer = "</feed>"
 
-        with open(Path(self.conf.outbox) / "atom.xml", 'w+') as rss_file:
+        with open(Path(self.conf.outbox) / "atom.xml", "w+") as rss_file:
             rss_file.write(header + articles + footer)
 
     def _copy_css(self):
diff --git a/blog/config.py b/blog/config.py
index 7e37bd3..4045e43 100644
--- a/blog/config.py
+++ b/blog/config.py
@@ -15,7 +15,7 @@ class Config:
         "draft",
         "author_name",
         "author_mail",
-        "id"
+        "id",
     }
 
     def __init__(self, config_file: Path):