Each commit contains s snapshot of the project / your user info /the date/a commit message and a SHA1 checksum
commit b650e3bd831aba05fa62d6f6d064e7ca02b5ee1b
Author: john <This email address is being protected from spambots. You need JavaScript enabled to view it.>
Date:   Wed Jan 11 00:45:10 2012 -0600
			Some cool commit message
		
This commits all items in the shopping carty (on staging).
git commit
Then type in your comment.
git commit -m'This is my new comment'