Need urgent help! 485 related

I just got below message this morning: -- which is so strange, as I have never request "more info" from USCIS. does any one has similar experience? what went wrong? the only thing I did was calling them around a month ago to update my change of address. Any thought? thanks!
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On August 10, 2005, we responded to your request for more information concerning your case. If you have not received our response within 30 days from this date, please call customer service at 1-800-375-5283.
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所有跟帖： 

• This maybe 485 RFE. Take easy -xiefeng- ♂ (42 bytes) () 08/25/2005 postreply 08:09:24

• This's response to your chang -ingaddres- ♀ (16 bytes) () 08/25/2005 postreply 09:38:01

• Not a REF -caomeipai- ♀ (157 bytes) () 08/25/2005 postreply 09:40:00

• 回複：Not a REF -shrek- ♀ (122 bytes) () 08/25/2005 postreply 11:05:04

• have u call CIS? check status. -TakeEasy- ♀ (0 bytes) () 08/25/2005 postreply 19:30:12