diff --git a/ru-ru/kotlin-ru.html.markdown b/ru-ru/kotlin-ru.html.markdown
index de04edae..21a14aee 100644
--- a/ru-ru/kotlin-ru.html.markdown
+++ b/ru-ru/kotlin-ru.html.markdown
@@ -1,6 +1,7 @@
 ---
 language: kotlin
 filename: LearnKotlin-ru.kt
+lang: ru-ru
 contributors:
     - ["S Webber", "https://github.com/s-webber"]
 translators: