company change / is there any change in h1-b

[venkatimmihelp]

hi,
all ,
i am working for a company "X", on H1-B visa,
now company X is purchased by company "Y",
what are the changes required for my h1-b , and what is the procedure, can i any help me in this regard,,,

" as of now , i know that i need to send a letter to INS /BCIS STATING THAT my h1b company name is changed"

is this enough...
i appreciate your help