PlantUML: Add notes to the participants in a sequence diagram

Using ‘note left of’, ‘note right of’ and ‘note over’  keywords we can add a notes relative the participants in a sequence diagram.

 

participantNotes.txt

@startuml

participant Client
participant LoginServer
participant ADServer

note left of Client #aqua
Client is responsible
to collect user credentials
end note

note right of ADServer #gold
Responsible to validate 
user credentials
end note

note over LoginServer #lightblue
Collect user credentials 
from client and
validate them 
with ADServer
end note

Client -> LoginServer: Enter user name
Client -> LoginServer: Enter password
Client -> LoginServer: Submit the form 
LoginServer -> ADServer: Check the credentials
ADServer -> LoginServer: Login Successful
LoginServer -> Client: Login Successful

@enduml

 

Above snippet generates below diagram.

 

 

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