diff --git a/Objects/memoryobject.c b/Objects/memoryobject.c
--- a/Objects/memoryobject.c
+++ b/Objects/memoryobject.c
@@ -1044,6 +1044,11 @@
     return -1;
 }
 
+PyDoc_STRVAR(memory_release_doc,
+"M.release() -> None\n\
+\n\
+Release the underlying buffer exposed by the memoryview object.");
+
 static PyObject *
 memory_release(PyMemoryViewObject *self, PyObject *noargs)
 {
@@ -1304,6 +1309,12 @@
    All casts must result in views that will have the exact byte
    size of the original input. Otherwise, an error is raised.
 */
+
+PyDoc_STRVAR(memory_cast_doc,
+"M.cast(format[, shape]) -> memoryview\n\
+\n\
+Cast a memoryview to a new format or shape.");
+
 static PyObject *
 memory_cast(PyMemoryViewObject *self, PyObject *args, PyObject *kwds)
 {
@@ -2061,6 +2072,11 @@
 
 /* Return a list representation of the memoryview. Currently only buffers
    with native format strings are supported. */
+PyDoc_STRVAR(memory_tolist_doc,
+"M.tobytes() -> list\n\
+\n\
+Return the data in the buffer as a list of elements.");
+
 static PyObject *
 memory_tolist(PyMemoryViewObject *mv, PyObject *noargs)
 {
@@ -2087,6 +2103,11 @@
     }
 }
 
+PyDoc_STRVAR(memory_tobytes_doc,
+"M.tobytes() -> bytes\n\
+\n\
+Return the data in the buffer as a bytestring.");
+
 static PyObject *
 memory_tobytes(PyMemoryViewObject *self, PyObject *dummy)
 {
@@ -2879,10 +2900,10 @@
 
 
 static PyMethodDef memory_methods[] = {
-    {"release",     (PyCFunction)memory_release, METH_NOARGS, NULL},
-    {"tobytes",     (PyCFunction)memory_tobytes, METH_NOARGS, NULL},
-    {"tolist",      (PyCFunction)memory_tolist, METH_NOARGS, NULL},
-    {"cast",        (PyCFunction)memory_cast, METH_VARARGS|METH_KEYWORDS, NULL},
+    {"release",     (PyCFunction)memory_release, METH_NOARGS, memory_release_doc},
+    {"tobytes",     (PyCFunction)memory_tobytes, METH_NOARGS, memory_tobytes_doc},
+    {"tolist",      (PyCFunction)memory_tolist, METH_NOARGS, memory_tolist_doc},
+    {"cast",        (PyCFunction)memory_cast, METH_VARARGS|METH_KEYWORDS, memory_cast_doc},
     {"__enter__",   memory_enter, METH_NOARGS, NULL},
     {"__exit__",    memory_exit, METH_VARARGS, NULL},
     {NULL,          NULL}