Text annotations are a way for a modeller to provide additional information to a BPMN diagram reader. The text annotation object can be associated with a specific object on the diagram, but this has no effect on the process flow.[1]
Symbol
1] Silver, B. (2009). BPMN Method and Style: A levels-based methodology for BPM process modeling and improvement using BPMN 2.0. In CodyCassidy Press US.