diff --git a/models/x500/model.sdf b/models/x500/model.sdf
index 0199eed..8b84a5c 100644
--- a/models/x500/model.sdf
+++ b/models/x500/model.sdf
@@ -68,5 +68,7 @@
10
velocity
+
+
diff --git a/worlds/default.sdf b/worlds/default.sdf
index c8effff..311fbff 100644
--- a/worlds/default.sdf
+++ b/worlds/default.sdf
@@ -15,6 +15,7 @@
ogre2
+