Optional descriptive text for an Extension end point

In cases where the final step of an Extension is "The use case ends", I think it would be useful to be able to capture some text to describe the 'failure guarantees' ("success guarantees of an Extension) or similar, and have this text appear on the Activity Diagram as a notation in the same way as 'Success Guarantees' are displayed at the use case end point.

As an example, a guarantee might be something like "A notification has been sent to the loan applicant", and this text would appear near the final step in a use case Extension.

I would make this an optional feature as it would not be required where the Extension resumes at a use case step.

Another related idea is to use an end point symbol for a final step of an Extension where the Extension does not resume at a step in the use case.