sequence.puml
PlantUML source of a sequence diagram from the Sequence diagrams post.
@startuml
participant C
participant A
participant B
C -> A: call
activate A
C <-- A: result
deactivate A
note right: Do something
C -> B: call(result)
activate B
C <-- B: result
deactivate B
note right: Do something\ndifferent
@enduml
PlantUML draws diagrams from plain text.
Paste the source into the online server,
or render it locally with plantuml -tsvg sequence.puml.