At the end of our evaluations our boss always asks: do you have anything to add? Questions? Evidence of something you did? Etc Then we tell “by the way I did XYZ.” Etc

Our boss always says that she might forget or miss something special or “above and beyond” that we did so we should bring it to evaluation meeting and show it to her or tell her that something was omitted

I’d never ask why my boss omitted something, but I sure would bring up that I did something or achieved something she didn’t include in the evaluation so she can include it.