diff --git a/es-es/lambda-calculus-es.html.markdown b/es-es/lambda-calculus-es.html.markdown
index fb8527e4..d49545c2 100644
--- a/es-es/lambda-calculus-es.html.markdown
+++ b/es-es/lambda-calculus-es.html.markdown
@@ -6,6 +6,7 @@ contributors:
     - ["Yan Hui Hang", "http://github.com/yanhh0"]
 translators:
     - ["Ivan Alburquerque", "https://github.com/AlburIvan"]
+lang: es-es
 ---
 
 # Cálculo Lambda