diff --git a/Objects/typeobject.c b/Objects/typeobject.c
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -596,6 +596,25 @@
     return result;
 }
 
+static int
+type_set_doc(PyTypeObject *type, PyObject *value, void *context)
+{
+    if (!(type->tp_flags & Py_TPFLAGS_HEAPTYPE)) {
+        PyErr_Format(PyExc_TypeError,
+                     "can't set %s.__doc__", type->tp_name);
+        return -1;
+    }
+    if (!value) {
+        PyErr_Format(PyExc_TypeError,
+                     "can't delete %s.__doc__", type->tp_name);
+        return -1;
+    }
+
+    PyType_Modified(type);
+
+    return PyDict_SetItemString(type->tp_dict, "__doc__", value);
+}
+
 static PyObject *
 type___instancecheck__(PyObject *type, PyObject *inst)
 {
@@ -631,7 +650,7 @@
     {"__abstractmethods__", (getter)type_abstractmethods,
      (setter)type_set_abstractmethods, NULL},
     {"__dict__",  (getter)type_dict,  NULL, NULL},
-    {"__doc__", (getter)type_get_doc, NULL, NULL},
+    {"__doc__", (getter)type_get_doc, (setter)type_set_doc, NULL},
     {0}
 };