Ypo <ypuntot@gmail.com> writes:

> Oh! Thanks
>
> I didn't understand. Maybe this would be more understandable?:
>
>>   When called with a ‘C-u’ prefix, prompt the user for a starting
>>      offset or, if there is a timer string at point, this is taken as the
>>      default, ...
> Or:
>
>>   When called with a ‘C-u’ prefix, there are 2 options: prompt the user for a starting
>>      offset.  Or, if there is a timer string at point, this is taken as the
>>      default, ...

Your versions still feel a bit confusing.
What about the attached patch?