diff --git a/es-es/yaml-es.html.markdown b/es-es/yaml-es.html.markdown
index 0423261a..a5157b5d 100644
--- a/es-es/yaml-es.html.markdown
+++ b/es-es/yaml-es.html.markdown
@@ -1,5 +1,6 @@
 ---
 language: yaml
+lang: es-es
 filename: learnyaml-es.yaml
 contributors:
   - ["Adam Brenecki", "https://github.com/adambrenecki"]