1 files changed, 5 insertions, 4 deletions
diff --git a/Lib/tarfile.py b/Lib/tarfile.py
index 5ada0ad626b..20e0394507f 100755
--- a/Lib/tarfile.py
+++ b/Lib/tarfile.py
@@ -330,10 +330,11 @@ class _LowLevelFile:
 class _Stream:
     """Class that serves as an adapter between TarFile and
        a stream-like object.  The stream-like object only
-       needs to have a read() or write() method and is accessed
-       blockwise.  Use of gzip or bzip2 compression is possible.
-       A stream-like object could be for example: sys.stdin,
-       sys.stdout, a socket, a tape device etc.
+       needs to have a read() or write() method that works with bytes,
+       and the method is accessed blockwise.
+       Use of gzip or bzip2 compression is possible.
+       A stream-like object could be for example: sys.stdin.buffer,
+       sys.stdout.buffer, a socket, a tape device etc.
 
        _Stream is intended to be used only internally.
     """