diff --git a/src/mixins/lang.js b/src/mixins/lang.js
index b7eb6f3d8..32d23e9f5 100644
--- a/src/mixins/lang.js
+++ b/src/mixins/lang.js
@@ -37,6 +37,7 @@ export default {
         /**
          * Change the language for the current page (no localstore set)
          * @param {string} lang Code of language to switch to.
+         * @returns {Promise<void>}
          */
         async changeCurrentPageLang(lang) {
             let message = (await langModules["../lang/" + lang + ".json"]()).default;