Re: [PATCH 04/13] support rollback on writes to checksummed files

"Dana How" [off-list ref] writes:

From 1df9e443ce11365f955b83e70365670ff9ada8d6 Mon Sep 17 00:00:00 2001
From: Dana How <redacted>
Date: Thu, 5 Apr 2007 13:13:42 -0700
Subject: [PATCH 04/13] support rollback on writes to checksummed files
add struct sha1posn, sha1mark(), sha1undo() to csum-file.[ch]

Have an empty line after "Subject:".  Begin a sentence with a
capital (i.e. "Add struct...").

Explain *why* these changes are needed, not just *what* the
patch does -- the latter can be read from the patch text.