indicate return value on __dir__ methods
diff --git a/Objects/moduleobject.c b/Objects/moduleobject.c
index d922249..3817ef3 100644
--- a/Objects/moduleobject.c
+++ b/Objects/moduleobject.c
@@ -437,7 +437,7 @@
 
 static PyMethodDef module_methods[] = {
     {"__dir__", module_dir, METH_NOARGS,
-     PyDoc_STR("__dir__() -> specialized dir() implementation")},
+     PyDoc_STR("__dir__() -> list\nspecialized dir() implementation")},
     {0}
 };