lab4.md

@@ -18,7 +18,7 @@ For this lab, we will only use the SPARQL part.
 The following command will start the database (you should add it to your screen):
 
 ```bash
-ros2 run ros2_kdb server --ros-args -p db_port:=101XX 
+ros2 run ros2_kdb kdb_server --ros-args -p db_port:=101XX 
 ```
 
 Replace XX with your group number. The database server is very verbose, you can generally ignore what is printed in the terminal.