diff --git a/i18n/cu.json b/i18n/cu.json
index e902605a..59b46128 100644
--- a/i18n/cu.json
+++ b/i18n/cu.json
@@ -8,6 +8,7 @@
 	"categorytree-portlet": "катигорїѩ",
 	"categorytree-category": "катигорїꙗ :",
 	"categorytree-mode-all": "вьсѩ страницѧ",
+	"categorytree-expand": "отврьꙁи",
 	"categorytree-num-categories": "$1 К҃",
 	"categorytree-num-pages": "$1 С҃",
 	"categorytree-num-files": "$1 Д҃"