diff --git a/bento_lib/streaming/exceptions.py b/bento_lib/streaming/exceptions.py
index 18e4758..0224d92 100644
--- a/bento_lib/streaming/exceptions.py
+++ b/bento_lib/streaming/exceptions.py
@@ -19,7 +19,7 @@ class StreamingException(Exception):
     pass
 
 
-RangeNotSatisfiableReason = Literal["start>=length", "end>=length", "inverted", "overlap"]
+RangeNotSatisfiableReason = Literal["start>=length", "end>=length", "inverted", "overlap", "proxied"]
 
 
 class StreamingRangeNotSatisfiable(StreamingException):