How to mix different plantuml diagram type elements?

I want to have deployment and sequence stuff in one and the same rendered plantuml picture. So I tried the following but it does not work, the rendering shows the sequence stuff for A, B and C as deployment.

How can I force rendering for "A->B" and "B->C" as sequence diagram stuff?

@startuml
file main.c
note right: I want to have description text here

A -> B : main()
note left : program\nentry function
B -> C : load()
note left : another important function
@enduml

I think you need to add your note later:

@startuml
title file main.c

A -> B : main()
note left : program\nentry function
B -> C : load()
note left : another important function

note right: I want to have description text here
@enduml

Result: