How to wrap text describing a responsibility

[JP]

Hi,

When I enter  the responsibility of a given class (or any text labelling an operation for instance), the width of those classes representations increase by the sizeof the text entered.

There doesn't seem to be a simple way to reduce the size (width) of the class by wrapping the text or even (a cumbersome way) by inserting a cariage return...

Would someone know a way to wrap a large text  ?

Thx