diff --git a/vi-vn/ruby-vi.html.markdown b/vi-vn/ruby-vi.html.markdown
index a50fe878..73382100 100644
--- a/vi-vn/ruby-vi.html.markdown
+++ b/vi-vn/ruby-vi.html.markdown
@@ -13,6 +13,7 @@ contributors:
   - ["Levi Bostian", "https://github.com/levibostian"]
   - ["Rahil Momin", "https://github.com/iamrahil"]
   - ["Vinh Nguyen", "http://rubydaily.net"]
+lang: vi-vn
 
 ---