diff --git a/spcd/util.py b/spcd/util.py
index 962d6fe..f4710b2 100644
--- a/spcd/util.py
+++ b/spcd/util.py
@@ -8,6 +8,7 @@ from rwx.log import stream as log
 
 
 def add_url_path(url: str, extra_path: str) -> str:
+    """Append an extra segment to an existing URL."""
     parts = urlparse(url)
     parts = parts._replace(path=str(Path(parts.path) / extra_path))
     return urlunparse(parts)