diff --git a/content/project/vlinder/vlinder.md b/content/project/vlinder/vlinder.md
index f5f81d390..cc8135d21 100644
--- a/content/project/vlinder/vlinder.md
+++ b/content/project/vlinder/vlinder.md
@@ -1,4 +1,5 @@
 ---
+id: vlinder
 title: Increasing happiness by providing a new perspective on people's lifestyle empowering them to act on Earth’s global problems.
 tags: crystaltwin, planned, experience
 countries: austria, russia