diff --git a/rwx/arg/__init__.py b/rwx/arg/__init__.py
index 71ce0a7..a35dd4f 100644
--- a/rwx/arg/__init__.py
+++ b/rwx/arg/__init__.py
@@ -4,6 +4,10 @@ import sys
 
 
 def split() -> tuple[str, list[str]]:
-    """Split command & actual arguments."""
+    """Split command & actual arguments.
+
+    :return: both
+    :rtype: tuple[str, list[str]]
+    """
     command, *arguments = sys.argv
     return command, arguments