diff --git a/_posts/blog/2025-08-28-sommerfest.markdown b/_posts/blog/2025-08-28-sommerfest.markdown
index c30868d..f6f3c5d 100644
--- a/_posts/blog/2025-08-28-sommerfest.markdown
+++ b/_posts/blog/2025-08-28-sommerfest.markdown
@@ -2,6 +2,7 @@
 layout: post
 title: "Sommerfest 2025"
 date: 2025-08-28 10:00
+lang: de
 ---
 
 ![Kollage: Sommerfest. Quelle: Eigenes Werk. Chaospott CC-BY-SA 4.0]({{ site.url }}/media/2023-09-01/clubgeburtstag.jpg)