#4614: document PyModule_Create and PyModuleDef struct.
diff --git a/Doc/c-api/module.rst b/Doc/c-api/module.rst
index 3a612e0..2c7faf0 100644
--- a/Doc/c-api/module.rst
+++ b/Doc/c-api/module.rst
@@ -73,6 +73,101 @@
raise :exc:`SystemError` and return *NULL*.
+.. cfunction:: void* PyModule_GetState(PyObject *module)
+
+ Return the "state" of the module, that is, a pointer to the block of memory
+ allocated at module creation time, or *NULL*. See
+ :cmember:`PyModuleDef.m_size`.
+
+
+.. cfunction:: PyModuleDef* PyModule_GetDef(PyObject *module)
+
+ Return a pointer to the :ctype:`PyModuleDef` struct from which the module was
+ created, or *NULL* if the module wasn't created with
+ :cfunc:`PyModule_Create`.
+
+
+Initializing C modules
+^^^^^^^^^^^^^^^^^^^^^^
+
+These functions are usually used in the module initialization function.
+
+.. cfunction:: PyObject* PyModule_Create(PyModuleDef *module)
+
+ Create a new module object, given the definition in *module*. This behaves
+ like :cfunc:`PyModule_Create2` with *module_api_version* set to
+ :const:`PYTHON_API_VERSION`.
+
+
+.. cfunction:: PyObject* PyModule_Create2(PyModuleDef *module, int module_api_version)
+
+ Create a new module object, given the definition in *module*, assuming the
+ API version *module_api_version*. If that version does not match the version
+ of the running interpreter, a :exc:`RuntimeWarning` is emitted.
+
+ .. note::
+
+ Most uses of this function should be using :cfunc:`PyModule_Create`
+ instead; only use this if you are sure you need it.
+
+
+.. ctype:: PyModuleDef
+
+ This struct holds all information that is needed to create a module object.
+ There is usually only one static variable of that type for each module, which
+ is statically initialized and then passed to :cfunc:`PyModule_Create` in the
+ module initialization function.
+
+ .. cmember:: PyModuleDef_Base m_base
+
+ Always initialize this member to :const:`PyModuleDef_HEAD_INIT`.
+
+ .. cmember:: char* m_name
+
+ Name for the new module.
+
+ .. cmember:: char* m_doc
+
+ Docstring for the module; usually a docstring variable created with
+ :cfunc:`PyDoc_STRVAR` is used.
+
+ .. cmember:: Py_ssize_t m_size
+
+ If the module object needs additional memory, this should be set to the
+ number of bytes to allocate; a pointer to the block of memory can be
+ retrieved with :cfunc:`PyModule_GetState`. If no memory is needed, set
+ this to ``-1``.
+
+ This memory should be used, rather than static globals, to hold per-module
+ state, since it is then safe for use in multiple sub-interpreters. It is
+ freed when the module object is deallocated, after the :cmember:`m_free`
+ function has been called, if present.
+
+ .. cmember:: PyMethodDef* m_methods
+
+ A pointer to a table of module-level functions, described by
+ :ctype:`PyMethodDef` values. Can be *NULL* if no functions are present.
+
+ .. cmember:: inquiry m_reload
+
+ Currently unused, should be *NULL*.
+
+ .. cmember:: traverseproc m_traverse
+
+ A traversal function to call during GC traversal of the module object, or
+ *NULL* if not needed.
+
+ .. cmember:: inquiry m_clear
+
+ A clear function to call during GC clearing of the module object, or
+ *NULL* if not needed.
+
+ .. cmember:: freefunc m_free
+
+ A function to call during deallocation of the module object, or *NULL* if
+ not needed.
+
+
.. cfunction:: int PyModule_AddObject(PyObject *module, const char *name, PyObject *value)
Add an object to *module* as *name*. This is a convenience function which can
@@ -105,4 +200,3 @@
.. cfunction:: int PyModule_AddStringMacro(PyObject *module, macro)
Add a string constant to *module*.
-