Add documentation about supported sites (Fixes #4503)

1 files changed, 7 insertions, 0 deletions

diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 43b7c94ba..efbe64fb3 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -464,6 +464,13 @@ class ExtractorError(Exception):
         return ''.join(traceback.format_tb(self.traceback))
 
 
+class UnsupportedError(ExtractorError):
+    def __init__(self, url):
+        super(UnsupportedError, self).__init__(
+            'Unsupported URL: %s' % url, expected=True)
+        self.url = url
+
+
 class RegexNotFoundError(ExtractorError):
     """Error when a regex didn't match"""
     pass