A note on commit messages: Though not required, it's a good idea to
begin the commit message with a single short (less than 50 character)
line summarizing the change, followed by a blank line and then a more
-thorough description. Tools that turn commits into email, for
-example, use the first line on the Subject: line and the rest of the
-commit in the body.
+thorough description. The text up to the first blank line in a commit
+message is treated as the commit title, and that title is used
+throughout git. For example, linkgit:git-format-patch[1] turns a
+commit into email, and it uses the title on the Subject line and the
+rest of the commit in the body.
Git tracks content not files
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