Focal review time is a mixed bag. It is the time of salary increases, but it also the time of justifying said increases.
I don’t suppose just putting “I worked on a bunch of bugs” would work for listing 2008’s accomplishments, as true as that statement may be.
You were a significant contributor to the optimization of the product?
Explain precisely what would have happened to the company, with lots of adjectives and dollar amounts, had you not been there to fix those bugs.