Turtlebot3.md

@@ -74,9 +74,9 @@ From the remote PC, connect to the Burger by ssh:
 Add the following lines in the .bashrc of the Burger to define the necessary environment variables for runnning ROS:
 
 ```plaintext
-+ export TURTLEBOT3_MODEL=burger
-+ export ROS_MASTER_URI=http://IP_OF_SERVER_RUNNING_ROSCORE:11311
-+ export ROS_HOSTNAME=IP_OF_BURGER
+export TURTLEBOT3_MODEL=burger
+export ROS_MASTER_URI=http://IP_OF_SERVER_RUNNING_ROSCORE:11311
+export ROS_HOSTNAME=IP_OF_BURGER
 ```
 
 Reinitialize the environment of your Burger:
@@ -93,7 +93,9 @@ Reinitialize the environment of your Burger:
 (Remote PC)>roscore
 ```
 
-* Starting the burger
+* Starting a real robot burger
+
+Define a specific namespace for each robot and initialize two parameters *multi_robot_name* and *set_lidar_frame_id* with the same namespace name
 
 ```plaintext
 (Remote PC)>ssh pi@{IP_ADDRESS_OF_BURGER}
@@ -101,7 +103,7 @@ Reinitialize the environment of your Burger:
 (Remote PC)>[ROS_NAMESPACE=myspace] roslaunch turtlebot3_bringup turtlebot3_remote.launch multi_robot_name:=myspace
 ```
 
-* Using a simulated burger with _gazebo_
+* Starting a simulated robot burger with _gazebo_
 
 ```plaintext
 (Remote PC)>roslaunch turtlebot3_gazebo turtlebot3_world.launch