diff --git a/src/epub_tts/__init__.py b/src/epub_tts/__init__.py
index 2c3ac1c..5318be8 100644
--- a/src/epub_tts/__init__.py
+++ b/src/epub_tts/__init__.py
@@ -1,11 +1,11 @@
 #!/usr/bin/env python3
- # -*- coding: utf-8 -*-
+# -*- coding: utf-8 -*-
 # Copyright (c) 2025-2026 Renato Xavier da Silveira Rosa
 # See [LICENSE](./LICENSE) or [BSD-3-Clause-Clear](https://spdx.org/licenses/BSD-3-Clause-Clear.html)
 
-# importlib.metadata from the standard library (added in Python 3.8) 
+# importlib.metadata from the standard library (added in Python 3.8)
 # or the importlib_metadata backport for earlier versions:
-from importlib.metadata import version, PackageNotFoundError
+from importlib.metadata import PackageNotFoundError, version
 
 try:
     __version__ = version("epub-tts")
diff --git a/src/epub_tts/__main__.py b/src/epub_tts/__main__.py
index facd6d7..949068d 100644
--- a/src/epub_tts/__main__.py
+++ b/src/epub_tts/__main__.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
- # -*- coding: utf-8 -*-
+# -*- coding: utf-8 -*-
 # Copyright (c) 2025-2026 Renato Xavier da Silveira Rosa
 # See [LICENSE](./LICENSE) or [BSD-3-Clause-Clear](https://spdx.org/licenses/BSD-3-Clause-Clear.html)
 
@@ -9,17 +9,23 @@ from argparse import ArgumentParser
 
 
 def main(args=None):
-    p =ArgumentParser(description="Convert EPUB to audio using TTS")
-    p.add_argument("--version", help="Show version and exit", action="version", version=f"%(prog)s {__import__('epub_tts').__version__}")
-    p.add_argument("-i","--input", help="Input EPUB file", required=True)
-    p.add_argument("-o","--output", help="Output audio file", required=True)
-    p.add_argument("-l","--language", help="Language to use for TTS")
-    p.add_argument("-v","--voice", help="Voice to use for TTS")
+    p = ArgumentParser(description="Convert EPUB to audio using TTS")
+    p.add_argument(
+        "--version",
+        help="Show version and exit",
+        action="version",
+        version=f"%(prog)s {__import__('epub_tts').__version__}",
+    )
+    p.add_argument("-i", "--input", help="Input EPUB file", required=True)
+    p.add_argument("-o", "--output", help="Output audio file", required=True)
+    p.add_argument("-l", "--language", help="Language to use for TTS")
+    p.add_argument("-v", "--voice", help="Voice to use for TTS")
 
     args = p.parse_args(args or sys.argv[1:])
-    print(f"Converting {args.input} to {args.output} using voice {args.voice}, language {args.language}, ...")
-    
+    print(
+        f"Converting {args.input} to {args.output} using voice {args.voice}, language {args.language}, ..."
+    )
 
 
 if __name__ == "__main__":
-    sys.exit(main())
\ No newline at end of file
+    sys.exit(main())