How long has it been under that status? I was told when additional information was requested from my employer, but it didn't seem like a standard notification they send out to all candidates. The program officer working on my case just happened to mention it in an email exchange with me.
If you are in touch with the person who wrote your reference letter, I suggest asking them to keep an eye out. Also, just in case the employer misses the email for whatever reason and doesn't respond in the allotted time (usually 1 week), the officer will let you know so you can contact them.