Launch-In-SITL.md

@@ -75,7 +75,7 @@ source <WORKSPACE_PATH>/devel/setup.bash
 rosrun droneoa_ros droneoa_ros
 ```
 
-## [Optional] Launch Node Manually:
+## [Alternative] Launch Node Manually:
 Using provided step1 step2 launch file is recommended.
 
 Open up a terminal with 4 tabs: