Architecting and designing : Business Process Analysis (BPA) : BPMN : Introduction to BPMN : Textual Annotation
  
Textual Annotation
You can use Text Annotations to provide additional information on the models for the reader of a BPMN Business process diagram. Text Annotations are displayed within an open rectangle attached to any symbol on a BPMN Business Process diagram by a straight line.
In System Architect, you add text annotations to symbols on a BPMN Business Process diagram by adding text to the Comment property within the Symbol tab of any symbol on a diagram.
Text Annotations do not affect the flow of the process.
See also
Introduction to BPMN