Annotation Link
The Annotation link connects the Annotation (Comments, Documentation, Textual Representation) elements to their respective parts. The following image is an example of an Annotation link connecting a Comment with a Requirement.
Creating an Annotation Link
To create an Annotation link from the System Structure Diagram toolbar:
1. On the System Structure Diagram toolbar, click the Annotation Link 
button.
button.2. Click the Annotation (Comment, Textual Representation) element on the diagram and then click the base item that it is related to.