diff --git a/flask_static_digest/__init__.py b/flask_static_digest/__init__.py
index 7b427cd..567575d 100644
--- a/flask_static_digest/__init__.py
+++ b/flask_static_digest/__init__.py
@@ -59,8 +59,8 @@ def _custom_url_join(self, url):
         This function will join the host URL with another URL.
         It differs from urljoin in that it will keep the path of the host URL
         even if url is an absolute path.
-        :param url_for: URL for the static file
-        :type url_for: str
+        :param url: the URL returned by url_for
+        :type url: str
         :return: Joined URL
         """
         if self.host_url is None: