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-rw-r--r--Doc/library/json.rst4
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diff --git a/Doc/library/json.rst b/Doc/library/json.rst
index 4ee17f2..a791259 100644
--- a/Doc/library/json.rst
+++ b/Doc/library/json.rst
@@ -125,6 +125,10 @@ Basic Usage
:class:`bytes` objects. Therefore, ``fp.write()`` must support :class:`str`
input.
+ If *ensure_ascii* is ``True`` (the default), the output is guaranteed to
+ have all incoming non-ASCII characters escaped. If *ensure_ascii* is
+ ``False``, these characters will be output as-is.
+
If *check_circular* is ``False`` (default: ``True``), then the circular
reference check for container types will be skipped and a circular reference
will result in an :exc:`OverflowError` (or worse).