Doc: Add missing forward reference in the tutorial. (GH-13499)
diff --git a/Doc/tutorial/controlflow.rst b/Doc/tutorial/controlflow.rst
index 9057345..cfb9645 100644
--- a/Doc/tutorial/controlflow.rst
+++ b/Doc/tutorial/controlflow.rst
@@ -482,9 +482,9 @@
dictionary (see :ref:`typesmapping`) containing all keyword arguments except for
those corresponding to a formal parameter. This may be combined with a formal
parameter of the form ``*name`` (described in the next subsection) which
-receives a tuple containing the positional arguments beyond the formal parameter
-list. (``*name`` must occur before ``**name``.) For example, if we define a
-function like this::
+receives a :ref:`tuple <tut-tuples>` containing the positional
+arguments beyond the formal parameter list. (``*name`` must occur
+before ``**name``.) For example, if we define a function like this::
def cheeseshop(kind, *arguments, **keywords):
print("-- Do you have any", kind, "?")