fuzzy string for jquery countdown addon

Hia,

while translating I came over this string, which I feel may not describe the functionality optionally:

!jquery_countdown is an optional module for Quiz. It is used to display a timer when taking a quiz. Without this timer, the user will not know how long he or she has left to complete the @quiz

Since I know falcon is Norwegian, here's a Norwegian translation I feel describes the functionality better:

!jquery_countdown er en valgfri tilleggsmodul for tester som lar deg begrense tiden en bruker har på å ta en test. Uten denne vil du ikke kunne tidsbegrense en test.

This would approximately be my English suggestion based on the above:

!jquery_countdown is an optional module for Quiz. It displays a countdown widget showing the time a user has left to complete a quiz. Without this module you will not be able to set a time limit on quizzes.

It's been a while since I tried the countdown integration, but as far as I remember you will not be able to time limit a quiz without it, and I feel the original string is a bit fuzzy in this regard.

What do you think? And does my suggestion feel ok for you native English speakers?