it was only suposed to fix the keyboard freezing problem
and here are more 'specs' on the update:
"MacBook MacBook Pro Software Update" (1.1)
"This update addresses a responsiveness issue on MacBook and MacBook Pro notebook computers. Some MacBook and MacBook Pro systems may occasionally experience a temporary suspension of keyboard input which can last a minute or longer. The Mac OS X 10.5.1 update is required before installing the MacBook, MacBook Pro Software Update 1.1."
Source: http://www.apple.com/support/downloads/macbookmacbookprosoftwareupdate11.html
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