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We recommend reading Chris Beams' great page on how to write a commit message. Here's a summary if you're in a hurry; each one is a link back to Chris' full description:
Separate the subject line from the body with a blank line
If the subject and body are contiguous, tools such as log won't be able to distinguish them.
Limit the subject line to 50 characters
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Use the imperative mood in the subject line
Git convention. This summary is written in the imperative.
Separate the subject line from the body with a blank line
If the subject and body are contiguous, tools such as log won't be able to distinguish them.
Wrap the body at 72 characters
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The code itself will explain how. If the code is too complex for that, it should have good commenting that does the job of explaining how.
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