diff --git a/rwx/grub/__init__.py b/rwx/grub/__init__.py
index b931ee3..a11cf7d 100644
--- a/rwx/grub/__init__.py
+++ b/rwx/grub/__init__.py
@@ -1,17 +1,17 @@
 import cmd
 import ps
 
-cmd.need('grub-mkimage')
+cmd.need("grub-mkimage")
 
-COMPRESSION = 'xz'
+COMPRESSION = "xz"
 ENV_BYTES = 1024
-ENV_COMMENT = '#'
-ENV_HEADER = f'''{ENV_COMMENT} GRUB Environment Block
-'''
+ENV_COMMENT = "#"
+ENV_HEADER = f"""{ENV_COMMENT} GRUB Environment Block
+"""
 MODULES = {
-    'i386-pc': [
-        ('biosdisk',),
-        ('ntldr',),
+    "i386-pc": [
+        ("biosdisk",),
+        ("ntldr",),
     ]
 }
 
@@ -19,14 +19,14 @@ MODULES = {
 def make_image(image_format: str, image_path: str, modules: list[str],
                memdisk_path: str, pubkey_path: str = None) -> None:
     args = [
-        ('grub-mkimage',),
-        ('--compress', COMPRESSION),
-        ('--format', image_format),
-        ('--output', image_path),
-        ('--memdisk', memdisk_path),
+        ("grub-mkimage",),
+        ("--compress", COMPRESSION),
+        ("--format", image_format),
+        ("--output", image_path),
+        ("--memdisk", memdisk_path),
     ]
     if pubkey_path:
-        args.append(('--pubkey', pubkey_path))
+        args.append(("--pubkey", pubkey_path))
     args.extend(modules)
     if modules := MODULES.get(image_format, None):
         args.extend(modules)