diff --git a/turtlebot3_gazebo/launch/turtlebot3_empty_world.launch b/turtlebot3_gazebo/launch/turtlebot3_empty_world.launch
index dbe1c05..b4cd188 100644
--- a/turtlebot3_gazebo/launch/turtlebot3_empty_world.launch
+++ b/turtlebot3_gazebo/launch/turtlebot3_empty_world.launch
@@ -5,7 +5,7 @@
-
+
diff --git a/turtlebot3_gazebo/launch/turtlebot3_world.launch b/turtlebot3_gazebo/launch/turtlebot3_world.launch
index ece4cdc..7b470de 100644
--- a/turtlebot3_gazebo/launch/turtlebot3_world.launch
+++ b/turtlebot3_gazebo/launch/turtlebot3_world.launch
@@ -5,7 +5,7 @@
-
+
diff --git a/turtlebot3_gazebo/worlds/empty.world b/turtlebot3_gazebo/models/empty.world
similarity index 100%
rename from turtlebot3_gazebo/worlds/empty.world
rename to turtlebot3_gazebo/models/empty.world
diff --git a/turtlebot3_gazebo/worlds/turtlebot3.world b/turtlebot3_gazebo/models/turtlebot3.world
similarity index 100%
rename from turtlebot3_gazebo/worlds/turtlebot3.world
rename to turtlebot3_gazebo/models/turtlebot3.world
diff --git a/turtlebot3_gazebo/worlds/turtlebot3/meshes/hexagon.dae b/turtlebot3_gazebo/models/turtlebot3/meshes/hexagon.dae
similarity index 100%
rename from turtlebot3_gazebo/worlds/turtlebot3/meshes/hexagon.dae
rename to turtlebot3_gazebo/models/turtlebot3/meshes/hexagon.dae
diff --git a/turtlebot3_gazebo/worlds/turtlebot3/meshes/wall.dae b/turtlebot3_gazebo/models/turtlebot3/meshes/wall.dae
similarity index 100%
rename from turtlebot3_gazebo/worlds/turtlebot3/meshes/wall.dae
rename to turtlebot3_gazebo/models/turtlebot3/meshes/wall.dae
diff --git a/turtlebot3_gazebo/worlds/turtlebot3/model.config b/turtlebot3_gazebo/models/turtlebot3/model.config
similarity index 100%
rename from turtlebot3_gazebo/worlds/turtlebot3/model.config
rename to turtlebot3_gazebo/models/turtlebot3/model.config
diff --git a/turtlebot3_gazebo/worlds/turtlebot3/model.sdf b/turtlebot3_gazebo/models/turtlebot3/model.sdf
similarity index 100%
rename from turtlebot3_gazebo/worlds/turtlebot3/model.sdf
rename to turtlebot3_gazebo/models/turtlebot3/model.sdf
diff --git a/turtlebot3_gazebo/package.xml b/turtlebot3_gazebo/package.xml
index 450d8ad..4d7a121 100644
--- a/turtlebot3_gazebo/package.xml
+++ b/turtlebot3_gazebo/package.xml
@@ -28,4 +28,7 @@
geometry_msgs
tf
gazebo_ros
+
+
+