added zip()
diff --git a/py/runtime.c b/py/runtime.c
index 2af86b6..02f965d 100644
--- a/py/runtime.c
+++ b/py/runtime.c
@@ -113,6 +113,7 @@
     mp_map_add_qstr(&map_builtins, MP_QSTR_set, (mp_obj_t)&set_type);
     mp_map_add_qstr(&map_builtins, MP_QSTR_tuple, (mp_obj_t)&tuple_type);
     mp_map_add_qstr(&map_builtins, MP_QSTR_type, (mp_obj_t)&mp_const_type);
+    mp_map_add_qstr(&map_builtins, MP_QSTR_zip, (mp_obj_t)&zip_type);
 
     // built-in user functions; TODO covert all to &mp_builtin_xxx's
     mp_map_add_qstr(&map_builtins, MP_QSTR_abs, rt_make_function_1(mp_builtin_abs));