diff --git a/src/llua_space.c b/src/llua_space.c
index 13185a8..5cff531 100644
--- a/src/llua_space.c
+++ b/src/llua_space.c
@@ -63,7 +63,9 @@ static int vectorL_distance(lua_State* L);
 static const luaL_reg vector_methods[] = {
   { "new",    vectorL_new },
   { "__add",  vectorL_add },
+  { "add",    vectorL_add },
   { "__sub",  vectorL_sub },
+  { "sub",    vectorL_sub },
   { "__mul",  vectorL_mul },
   { "__div",  vectorL_div },
   { "get",    vectorL_get },