How do I modify the commit message (not the topmost one) of a git commit?

From: Norah Jones <nh.jones01@gmail.com>
Date: May 4, 2013, 06:31 UTC
Message-ID: <abcd1234abc123ab12a0000000345000020000004001@gmail.com>

Hi,

I did a series of commits and now I find one of my commit (not the topmost one) has an incorrect commit message. How can I change that specific one? I believe "git commit --amend" works only for the last commit.

Thanks, Norah Jones

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