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-rw-r--r--docs/library/uos.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/library/uos.rst b/docs/library/uos.rst
index c073f079d..c7460134b 100644
--- a/docs/library/uos.rst
+++ b/docs/library/uos.rst
@@ -115,7 +115,8 @@ Terminal redirection and duplication
.. function:: dupterm(stream_object, index=0)
Duplicate or switch the MicroPython terminal (the REPL) on the given `stream`-like
- object. The *stream_object* argument must implement the ``readinto()`` and
+ object. The *stream_object* argument must be a native stream object, or derive
+ from ``uio.IOBase`` and implement the ``readinto()`` and
``write()`` methods. The stream should be in non-blocking mode and
``readinto()`` should return ``None`` if there is no data available for reading.