Issue #10779: PyErr_WarnExplicit() decodes the filename from the filesystem
encoding instead of UTF-8.
diff --git a/Doc/c-api/exceptions.rst b/Doc/c-api/exceptions.rst
index 9fec46f..24ca264 100644
--- a/Doc/c-api/exceptions.rst
+++ b/Doc/c-api/exceptions.rst
@@ -297,8 +297,9 @@
is a straightforward wrapper around the Python function
:func:`warnings.warn_explicit`, see there for more information. The *module*
and *registry* arguments may be set to *NULL* to get the default effect
- described there. *message*, *filename* and *module* are UTF-8 encoded
- strings.
+ described there. *message* and *module* are UTF-8 encoded strings,
+ *filename* is decoded from the filesystem encoding
+ (:func:`sys.getfilesystemencoding`).
.. c:function:: int PyErr_WarnFormat(PyObject *category, Py_ssize_t stack_level, const char *format, ...)