diff --git a/src/js/game/hud/parts/debug_info.js b/src/js/game/hud/parts/debug_info.js
index d79dd0a1..33644f33 100644
--- a/src/js/game/hud/parts/debug_info.js
+++ b/src/js/game/hud/parts/debug_info.js
@@ -4,6 +4,7 @@ import { DynamicDomAttach } from "../dynamic_dom_attach";
 import { KEYMAPPINGS } from "../../key_action_mapper";
 import { Vector } from "../../../core/vector";
 
+/** @enum {string} */
 export const enumDebugOverlayMode = { disabled: "disabled", regular: "regular", detailed: "detailed" };
 
 export class HUDDebugInfo extends BaseHUDPart {