diff --git a/youtube_dl/extractor/generic.py b/youtube_dl/extractor/generic.py
index b01900afa..85315eb04 100644
--- a/youtube_dl/extractor/generic.py
+++ b/youtube_dl/extractor/generic.py
@@ -3701,7 +3701,7 @@ class GenericIE(InfoExtractor):
                 return self.url_result(embed_url)
 
         if not found:
-            raise UnsupportedError(url)
+            raise UnsupportedError(f"The URL '{url}' might not be supported by youtube-dl.")
 
         entries = []
         for video_url in orderedSet(found):