Text associated with the thread representation

Hello 

For some time now I've had a problem with my thread representations. When I insert one on a part, it doesn't show me any associated text. In my memories it should automatically write the size of the thread so that it can then indicate it in the drawing. 

 

I can't find a solution, nor even the thread library to modify them. 

Do you have an idea for him to submit the associated texts? 

Thank you in advance.