diff --git a/libpurple_to_markdown/__main__.py b/libpurple_to_markdown/__main__.py
index da90b7a..eb2317d 100644
--- a/libpurple_to_markdown/__main__.py
+++ b/libpurple_to_markdown/__main__.py
@@ -109,8 +109,7 @@ def main():
     for chat_id, messages_in_chat_original in messages_by_chat_id.items():
         messages_in_chat = merge_adjacent_messages(messages_in_chat_original)
         if len(messages_in_chat) <= 2:
-            logger.info(
-                '  "%s": Skipped due to too few messages', chat_id)
+            logger.info('  "%s": Skipped due to too few messages', chat_id)
             continue
 
         messages_by_period = group_messages_by_period(messages_in_chat)
@@ -123,8 +122,10 @@ def main():
         )
 
         for period_key, messages in messages_by_period.items():
-            file_escaped_chat_id = chat_id.replace(' ','-')
-            output_file = args.output / chat_id / f'{file_escaped_chat_id}-{period_key}.md'
+            file_escaped_chat_id = chat_id.replace(' ', '-')
+            output_file = (
+                args.output / chat_id / f'{file_escaped_chat_id}-{period_key}.md'
+            )
             output_file.parent.mkdir(exist_ok=True)
             logger.info('Writing % 5d messages to %s', len(messages), output_file)
             with open(output_file, 'w') as f:
diff --git a/libpurple_to_markdown/synctech_sms.py b/libpurple_to_markdown/synctech_sms.py
index 1b49ad5..aae2f22 100644
--- a/libpurple_to_markdown/synctech_sms.py
+++ b/libpurple_to_markdown/synctech_sms.py
@@ -17,6 +17,7 @@ from .data import MYSELF, Message
 
 logger = logging.getLogger(__name__)
 
+
 def is_named_number(num: str) -> str:
     try:
         int(num.removeprefix('+').replace(' ', ''))
@@ -24,6 +25,7 @@ def is_named_number(num: str) -> str:
     except ValueError:
         return True
 
+
 def normalize_phone_number(num: str) -> str:
     if is_named_number(num):
         return num
diff --git a/test/test_synctech_sms.py b/test/test_synctech_sms.py
index fc98d02..39d1e6e 100644
--- a/test/test_synctech_sms.py
+++ b/test/test_synctech_sms.py
@@ -10,5 +10,6 @@ def test_normalize_phone_number():
     assert synctech_sms.normalize_phone_number('441234567890') == '+441234567890'
     assert synctech_sms.normalize_phone_number('004712345678') == '+4712345678'
 
+
 def test_dont_normalize_weird():
     assert synctech_sms.normalize_phone_number('Midttrafik') == 'Midttrafik'