clarified performer example (#390)

Signed-off-by: osrf <jenn@openrobotics.org>
gazebosim · Sep 29, 2020 · 584199e · 584199e
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commit 584199e
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/tutorials/levels.md b/tutorials/levels.md
@@ -235,7 +235,9 @@ successfuly added.
 ign gazebo levels_no_performers.sdf -v 4 --levels
 ```
 
-2. In another terminal call the add performer service.
+Here you will see the two vehicles, which are regular models that do not trigger level loading. They are not performers until you call the service.
+
+2. In another terminal call the add performer service for the blue vehicle.
 
 ```
 ign service -s /world/levels/level/set_performer --reqtype ignition.msgs.StringMsg --reptype ignition.msgs.Boolean --timeout 2000 --req 'data: "vehicle_blue"'