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-rw-r--r--Doc/extending/extending.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/Doc/extending/extending.rst b/Doc/extending/extending.rst
index 7986ea1..5b32a2c 100644
--- a/Doc/extending/extending.rst
+++ b/Doc/extending/extending.rst
@@ -536,7 +536,7 @@ Later, when it is time to call the function, you call the C function
:c:func:`PyObject_CallObject`. This function has two arguments, both pointers to
arbitrary Python objects: the Python function, and the argument list. The
argument list must always be a tuple object, whose length is the number of
-arguments. To call the Python function with no arguments, pass in NULL, or
+arguments. To call the Python function with no arguments, pass in ``NULL``, or
an empty tuple; to call it with one argument, pass a singleton tuple.
:c:func:`Py_BuildValue` returns a tuple when its format string consists of zero
or more format codes between parentheses. For example::