Issue #1772673: The type of `char*` arguments now changed to `const char*`.
diff --git a/Doc/c-api/mapping.rst b/Doc/c-api/mapping.rst
index 0ef2961..2803fd0 100644
--- a/Doc/c-api/mapping.rst
+++ b/Doc/c-api/mapping.rst
@@ -22,7 +22,7 @@
expression ``len(o)``.
-.. c:function:: int PyMapping_DelItemString(PyObject *o, char *key)
+.. c:function:: int PyMapping_DelItemString(PyObject *o, const char *key)
Remove the mapping for object *key* from the object *o*. Return ``-1`` on
failure. This is equivalent to the Python statement ``del o[key]``.
@@ -67,13 +67,13 @@
the Python expression ``list(o.items())``.
-.. c:function:: PyObject* PyMapping_GetItemString(PyObject *o, char *key)
+.. c:function:: PyObject* PyMapping_GetItemString(PyObject *o, const char *key)
Return element of *o* corresponding to the object *key* or *NULL* on failure.
This is the equivalent of the Python expression ``o[key]``.
-.. c:function:: int PyMapping_SetItemString(PyObject *o, char *key, PyObject *v)
+.. c:function:: int PyMapping_SetItemString(PyObject *o, const char *key, PyObject *v)
Map the object *key* to the value *v* in object *o*. Returns ``-1`` on failure.
This is the equivalent of the Python statement ``o[key] = v``.