diff --git a/rwx/cmd/__init__.py b/rwx/cmd/__init__.py
index ca4dced..be9e540 100644
--- a/rwx/cmd/__init__.py
+++ b/rwx/cmd/__init__.py
@@ -5,7 +5,11 @@ packages: list[str] = []
 
 
 def need(command: str) -> None:
-    """Assert package dependency for a command."""
+    """Assert package dependency for a command.
+
+    :param command: name of the requested command
+    :type command: str
+    """
     package: str | None
     match command:
         case "debootstrap":
diff --git a/rwx/cmd/squashfs/__init__.py b/rwx/cmd/squashfs/__init__.py
index db603da..b3ec864 100644
--- a/rwx/cmd/squashfs/__init__.py
+++ b/rwx/cmd/squashfs/__init__.py
@@ -1,16 +1,24 @@
 """Wrap SquashFS commands."""
 
+from pathlib import Path
+
 from rwx import cmd, ps
 
 cmd.need("mksquashfs")
 
 
-def mksquashfs(input_root: str, output_file: str) -> None:
-    """Make a SquashFS bootable image file."""
+def mksquashfs(input_root: Path, output_file: Path) -> None:
+    """Make a SquashFS bootable image file.
+
+    :param input_root: ?
+    :type input_root: Path
+    :param output_file: ?
+    :type output_file: Path
+    """
     ps.run(
         "mksquashfs",
-        input_root,
-        output_file,
+        str(input_root),
+        str(output_file),
         "-comp",
         "zstd",
         "-Xcompression-level",