Auto-populate text box in a diagram

How can you auto-populate a text box to show the documentation of another element in a diagram?
I'm trying to map the Documentation under a Strategic Taxonomy package to auto-populate a text box in a Strategic Taxonomy diagram.
Is there an element I can leverage that for every Strategic Taxonomy diagram, this auto-populated text box will always appear upon diagram creation?
Thanks in advance,
Jill
I'm trying to map the Documentation under a Strategic Taxonomy package to auto-populate a text box in a Strategic Taxonomy diagram.
Is there an element I can leverage that for every Strategic Taxonomy diagram, this auto-populated text box will always appear upon diagram creation?
Thanks in advance,
Jill