diff --git a/plantStructC4.adoc b/plantStructC4.adoc
index 934ba3d..5a187c3 100644
--- a/plantStructC4.adoc
+++ b/plantStructC4.adoc
@@ -6,6 +6,12 @@
 
 Open Online PlantUML Server: http://www.plantuml.com/plantuml/uml/SyfFKj2rKt3CoKnELR1Io4ZDoSa70000 
 
+Opens with a one-arrow sequence diagram in text form
+
+ @startuml
+Bob -> Alice : hello
+@enduml
+
 https://plantuml.com/
  <= home page, PlantUML +
 https://crashedmind.github.io/PlantUMLHitchhikersGuide/