diff --git a/rssingle.py b/rssingle.py
index f1862bd..d7a804a 100755
--- a/rssingle.py
+++ b/rssingle.py
@@ -45,7 +45,7 @@ def setup_logging() -> None:
     return None
 
 
-def get_url_from_feed(config):
+def get_url_from_feed(config) -> str:
     """
     This function returns the URL from a feed.
     """