How to prevent change # to a number?

Question

I'm using sequence and when the message begins with # it is changed to a number. I need to use messages beginning with #

How can we avoid it?

Thanks.

 

Example:

@startuml

Bob -> Alice: #Hello Alice#

Bob <-- Alice: #Hello Bob#

@enduml

Answer 1

I have founded.

We need to use tilde ~