diff --git a/Menu.d.ts b/Menu.d.ts
index 8c418bf..4c98309 100644
--- a/Menu.d.ts
+++ b/Menu.d.ts
@@ -9,11 +9,11 @@ declare namespace menu {
 
     type featureTypes = "parent"|"toggle"|"action"|"value_i"|"action_value_i"|"autoaction_value_i";
 
-    function add_feature(name: string, type: featureTypes, parent: Feature, script_handler: (feat: Feat) => void|never): Feat;
+    function add_feature(name: string, type: featureTypes, parent: Feature, script_handler?: (feat: Feat) => void|never): Feat;
     function delete_feature(id: int): boolean;
     function set_menu_can_navigate(): void;
     function get_version(): void;
-    function add_player_feature(name: string, type: string, parent: integer, script_handler: (feat: Feat) => void|never): PlayerFeat
+    function add_player_feature(name: string, type: string, parent: integer, script_handler?: (feat: Feat) => void|never): PlayerFeat
     function get_player_feature(i: uint32_t): PlayerFeat
     function is_threading_mode(mode: int): boolean
     /**