about changing address

hello everyone,

I (H1B) have a question about changing address. Last December I moved out my old apartment and to a new place in the city (boston).

I heard that we have to inform somewhere about this,

http://uscis.gov/graphics/formsfee/forms/files/ar-11sr.pdf

do we have to do this? confused. one of my friend told me they don't require this anymore. Does anyone have any update on this?

Thanks a lot

Samk