diff --git a/wud/docker-compose.yml b/wud/docker-compose.yml
index 0852fa0..0277172 100644
--- a/wud/docker-compose.yml
+++ b/wud/docker-compose.yml
@@ -1,3 +1,4 @@
+---
 services:
   whatsupdocker:
     image: ${DOCKER_REGISTRY:-}getwud/wud