Fix markup.
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index 111ad8b..66dc180 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -1807,7 +1807,7 @@
.. method:: object.__length_hint__(self)
- Called to implement ``operator.length_hint``. Should return an estimated
+ Called to implement :func:`operator.length_hint`. Should return an estimated
length for the object (which may be greater or less than the actual length).
The length must be an integer ``>=`` 0. This method is purely an
optimization and is never required for correctness.