The "-u" option is described only in terms of "updating"
files, which in turn is described only as "similar to what
git commit -a does". Let's be a little more specific about
what updating entails.

Suggested by Geoffrey Irving.

Signed-off-by: Jeff King <peff@peff.net>
---
The wrapping is funny to make the text diff easier to read. Junio, do
you prefer it that way, or in the canonical form?

 Documentation/git-add.txt |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/Documentation/git-add.txt b/Documentation/git-add.txt
index 35e67a0..e2389e3 100644
--- a/Documentation/git-add.txt
+++ b/Documentation/git-add.txt
@@ -71,7 +71,9 @@ OPTIONS
 	the specified filepatterns before exiting.
 
 -u::
-	Update only files that git already knows about. This is similar
+	Update only files that git already knows about, staging modified
+	content for commit and marking deleted files for removal. This
+	is similar
 	to what "git commit -a" does in preparation for making a commit,
 	except that the update is limited to paths specified on the
 	command line. If no paths are specified, all tracked files in the
-- 
1.5.5.1.274.g7b68b
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