diff --git a/Doc/c-api/module.rst b/Doc/c-api/module.rst
index 29d5cd8d5391a3..774d5f7cd34166 100644
--- a/Doc/c-api/module.rst
+++ b/Doc/c-api/module.rst
@@ -96,6 +96,8 @@ Module Objects
    allocated at module creation time, or ``NULL``.  See
    :c:member:`PyModuleDef.m_size`.
 
+   See :pep:`489` for more details.
+
 
 .. c:function:: PyModuleDef* PyModule_GetDef(PyObject *module)